{"slug":"common-molecules","title":"List of common molecules","shortTitle":"Common molecules","description":"A practical list of everyday, atmospheric, laboratory, industrial, and biological molecules with reusable identifiers.","seoTitle":"List of common molecules","seoDescription":"Browse a common molecules list with formulas, categories, SMILES, PubChem IDs, source notes, and CSV/JSON downloads.","keywords":["list of common molecules","common molecules list"],"aliases":["list-of-common-molecules","common-molecules-list"],"updatedAt":"2026-05-02","audience":"Users who need a broad starter set for examples, demos, lessons, and cross-tool testing.","methodology":"Commonness is defined by educational and practical use rather than database frequency. Rows are grouped by everyday, atmospheric, biological, laboratory, and industrial contexts.","expansionPlan":"Add popularity signals from query logs, textbook coverage, regulatory lists, and curated educational sources while keeping source provenance visible per row.","sources":[{"name":"PubChem","url":"https://pubchem.ncbi.nlm.nih.gov/","role":"Canonical compound identifiers, names, formulas, structures, SMILES, and downloadable compound records.","licenseNote":"NCBI places no restrictions on PubChem data, though original submitters may retain rights in submitted records."},{"name":"ChEBI","url":"https://www.ebi.ac.uk/chebi/downloadsForward.do","role":"Chemical ontology classes, biological roles, synonyms, formulas, SMILES, InChI, and ChEBI identifiers.","licenseNote":"ChEBI provides ontology, flat-file, SDF, and SQL downloads from EMBL-EBI."},{"name":"NIST Chemistry WebBook","url":"https://webbook.nist.gov/chemistry/","role":"Reference physical chemistry data and diatomic constants for selected species.","licenseNote":"NIST SRD 69 should be cited and linked rather than mirrored wholesale."},{"name":"OpenStax Chemistry","url":"https://openstax.org/details/books/chemistry-2e","role":"Chemistry definitions used for educational polarity, bonding, organic chemistry, and molecule-class explanations."}],"columns":[{"key":"name","label":"Name"},{"key":"formula","label":"Formula"},{"key":"category","label":"Category"},{"key":"smiles","label":"SMILES"},{"key":"pubchemCid","label":"PubChem CID"},{"key":"sourceIds","label":"Source IDs"},{"key":"notes","label":"Notes"}],"rows":[{"id":"water","name":"Water","formula":"H2O","category":"Everyday molecule","smiles":"O","pubchemCid":"962","sourceIds":["PubChem CID 962","ChEBI CHEBI:15377"]},{"id":"carbon-dioxide","name":"Carbon dioxide","formula":"CO2","category":"Atmospheric molecule","smiles":"O=C=O","pubchemCid":"280","sourceIds":["PubChem CID 280","ChEBI CHEBI:16526"]},{"id":"oxygen","name":"Oxygen","formula":"O2","category":"Atmospheric molecule","smiles":"O=O","pubchemCid":"977","sourceIds":["PubChem CID 977"]},{"id":"sodium-chloride","name":"Sodium chloride","formula":"NaCl","category":"Everyday ionic compound","smiles":"[Na+].[Cl-]","pubchemCid":"5234","sourceIds":["PubChem CID 5234"]},{"id":"ethanol","name":"Ethanol","formula":"C2H6O","category":"Laboratory and consumer molecule","smiles":"CCO","pubchemCid":"702","sourceIds":["PubChem CID 702","ChEBI CHEBI:16236"]},{"id":"glucose","name":"D-Glucose","formula":"C6H12O6","category":"Biological molecule","smiles":"C([C@@H]1[C@H]([C@@H]([C@H](C(O1)O)O)O)O)O","pubchemCid":"5793","sourceIds":["PubChem CID 5793","ChEBI CHEBI:17234"]},{"id":"ammonia","name":"Ammonia","formula":"NH3","category":"Industrial and laboratory molecule","smiles":"N","pubchemCid":"222","sourceIds":["PubChem CID 222"]},{"id":"hydrogen-peroxide","name":"Hydrogen peroxide","formula":"H2O2","category":"Consumer and laboratory molecule","smiles":"OO","pubchemCid":"784","sourceIds":["PubChem CID 784"]},{"id":"acetic-acid","name":"Acetic acid","formula":"C2H4O2","category":"Everyday organic acid","smiles":"CC(=O)O","pubchemCid":"176","sourceIds":["PubChem CID 176","ChEBI CHEBI:15366"]},{"id":"calcium-carbonate","name":"Calcium carbonate","formula":"CaCO3","category":"Mineral and biological material","smiles":"[Ca+2].[O-]C([O-])=O","pubchemCid":"10112","sourceIds":["PubChem CID 10112"]},{"id":"methane","name":"Methane","formula":"CH4","category":"Fuel and atmospheric molecule","smiles":"C","pubchemCid":"297","sourceIds":["PubChem CID 297"]},{"id":"nitrogen","name":"Nitrogen","formula":"N2","category":"Atmospheric molecule","smiles":"N#N","pubchemCid":"947","sourceIds":["PubChem CID 947"]},{"id":"ozone","name":"Ozone","formula":"O3","category":"Atmospheric molecule","smiles":"[O-][O+]=O","pubchemCid":"24823","sourceIds":["PubChem CID 24823"]},{"id":"sodium-bicarbonate","name":"Sodium bicarbonate","formula":"NaHCO3","category":"Everyday ionic compound","smiles":"C(=O)(O)[O-].[Na+]","pubchemCid":"516892","sourceIds":["PubChem CID 516892"]},{"id":"sucrose","name":"Sucrose","formula":"C12H22O11","category":"Food and biological molecule","smiles":"C([C@@H]1[C@H]([C@@H]([C@H]([C@H](O1)O[C@]2([C@H]([C@@H]([C@H](O2)CO)O)O)CO)O)O)O)O","pubchemCid":"5988","sourceIds":["PubChem CID 5988"]},{"id":"urea","name":"Urea","formula":"CH4N2O","category":"Biological and agricultural molecule","smiles":"C(=O)(N)N","pubchemCid":"1176","sourceIds":["PubChem CID 1176"]},{"id":"carbon-monoxide","name":"Carbon monoxide","formula":"CO","category":"Atmospheric and combustion molecule","smiles":"[C-]#[O+]","pubchemCid":"281","sourceIds":["PubChem CID 281"]},{"id":"sulfur-dioxide","name":"Sulfur dioxide","formula":"SO2","category":"Industrial and atmospheric molecule","smiles":"O=S=O","pubchemCid":"1119","sourceIds":["PubChem CID 1119"]},{"id":"hydrogen","name":"Hydrogen","formula":"H2","category":"Fuel and atmospheric molecule","smiles":"[HH]","pubchemCid":"783","sourceIds":["PubChem CID 783"]},{"id":"helium","name":"Helium","formula":"He","category":"Noble gas","smiles":"[He]","pubchemCid":"23987","sourceIds":["PubChem CID 23987"]},{"id":"argon","name":"Argon","formula":"Ar","category":"Noble gas","smiles":"[Ar]","pubchemCid":"23968","sourceIds":["PubChem CID 23968"]},{"id":"chlorine","name":"Chlorine","formula":"Cl2","category":"Industrial molecule","smiles":"ClCl","pubchemCid":"24526","sourceIds":["PubChem CID 24526"]},{"id":"propane","name":"Propane","formula":"C3H8","category":"Fuel molecule","smiles":"CCC","pubchemCid":"6334","sourceIds":["PubChem CID 6334"]},{"id":"butane","name":"Butane","formula":"C4H10","category":"Fuel molecule","smiles":"CCCC","pubchemCid":"7843","sourceIds":["PubChem CID 7843"]},{"id":"acetone","name":"Acetone","formula":"C3H6O","category":"Laboratory and consumer 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chloride","formula":"HCl","category":"Laboratory acid gas","smiles":"Cl","pubchemCid":"313","sourceIds":["PubChem CID 313"]},{"id":"sulfuric-acid","name":"Sulfuric acid","formula":"H2SO4","category":"Industrial acid","smiles":"OS(=O)(=O)O","pubchemCid":"1118","sourceIds":["PubChem CID 1118"]},{"id":"nitric-acid","name":"Nitric acid","formula":"HNO3","category":"Laboratory and industrial acid","smiles":"[N+](=O)(O)[O-]","pubchemCid":"944","sourceIds":["PubChem CID 944"]},{"id":"phosphoric-acid","name":"Phosphoric acid","formula":"H3PO4","category":"Food and laboratory acid","smiles":"OP(=O)(O)O","pubchemCid":"1004","sourceIds":["PubChem CID 1004"]},{"id":"calcium-hydroxide","name":"Calcium hydroxide","formula":"Ca(OH)2","category":"Common base","smiles":"[OH-].[OH-].[Ca+2]","pubchemCid":"6093208","sourceIds":["PubChem CID 6093208"]},{"id":"sodium-hydroxide","name":"Sodium hydroxide","formula":"NaOH","category":"Common 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23935"]},{"id":"nitrous-oxide","name":"Nitrous Oxide","formula":"N2O","category":"Common molecule","smiles":"[N-]=[N+]=O","pubchemCid":"948","sourceIds":["PubChem CID 948"]},{"id":"isopropanol","name":"Isopropanol","formula":"C3H8O","category":"Common molecule","smiles":"CC(C)O","pubchemCid":"3776","sourceIds":["PubChem CID 3776"]},{"id":"lactic-acid","name":"Lactic Acid","formula":"C3H6O3","category":"Common molecule","smiles":"CC(C(=O)O)O","pubchemCid":"612","sourceIds":["PubChem CID 612"]},{"id":"fructose","name":"Fructose","formula":"C6H12O6","category":"Common molecule","smiles":"C1[C@H]([C@H]([C@@H](C(O1)(CO)O)O)O)O","pubchemCid":"2723872","sourceIds":["PubChem CID 2723872"]},{"id":"nicotine","name":"Nicotine","formula":"C10H14N2","category":"Common molecule","smiles":"CN1CCC[C@H]1C2=CN=CC=C2","pubchemCid":"89594","sourceIds":["PubChem CID 89594"]},{"id":"glycerol","name":"Glycerol","formula":"C3H8O3","category":"Common molecule","smiles":"C(C(CO)O)O","pubchemCid":"753","sourceIds":["PubChem CID 753"]},{"id":"ethylene-glycol","name":"Ethylene Glycol","formula":"C2H6O2","category":"Common molecule","smiles":"C(CO)O","pubchemCid":"174","sourceIds":["PubChem CID 174"]},{"id":"acetaldehyde","name":"Acetaldehyde","formula":"C2H4O","category":"Common molecule","smiles":"CC=O","pubchemCid":"177","sourceIds":["PubChem CID 177"]},{"id":"ethyl-acetate","name":"Ethyl Acetate","formula":"C4H8O2","category":"Common molecule","smiles":"CCOC(=O)C","pubchemCid":"8857","sourceIds":["PubChem CID 8857"]},{"id":"diethyl-ether","name":"Diethyl Ether","formula":"C4H10O","category":"Common molecule","smiles":"CCOCC","pubchemCid":"3283","sourceIds":["PubChem CID 3283"]},{"id":"chloroform","name":"Chloroform","formula":"CHCl3","category":"Common molecule","smiles":"C(Cl)(Cl)Cl","pubchemCid":"6212","sourceIds":["PubChem CID 6212"]},{"id":"dichloromethane","name":"Dichloromethane","formula":"CH2Cl2","category":"Common molecule","smiles":"C(Cl)Cl","pubchemCid":"6344","sourceIds":["PubChem CID 6344"]},{"id":"acetonitrile","name":"Acetonitrile","formula":"C2H3N","category":"Common molecule","smiles":"CC#N","pubchemCid":"6342","sourceIds":["PubChem CID 6342"]},{"id":"dimethyl-sulfoxide","name":"Dimethyl Sulfoxide","formula":"C2H6OS","category":"Common molecule","smiles":"CS(=O)C","pubchemCid":"679","sourceIds":["PubChem CID 679"]},{"id":"glycine","name":"Glycine","formula":"C2H5NO2","category":"Common molecule","smiles":"C(C(=O)O)N","pubchemCid":"750","sourceIds":["PubChem CID 750"]},{"id":"alanine","name":"Alanine","formula":"C3H7NO2","category":"Common molecule","smiles":"C[C@@H](C(=O)O)N","pubchemCid":"5950","sourceIds":["PubChem CID 5950"]},{"id":"lysine","name":"Lysine","formula":"C6H14N2O2","category":"Common molecule","smiles":"C(CCN)C[C@@H](C(=O)O)N","pubchemCid":"5962","sourceIds":["PubChem CID 5962"]},{"id":"cholesterol","name":"Cholesterol","formula":"C27H46O","category":"Common molecule","smiles":"C[C@H](CCCC(C)C)[C@H]1CC[C@@H]2[C@@]1(CC[C@H]3[C@H]2CC=C4[C@@]3(CC[C@@H](C4)O)C)C","pubchemCid":"5997","sourceIds":["PubChem CID 5997"]},{"id":"palmitic-acid","name":"Palmitic Acid","formula":"C16H32O2","category":"Common molecule","smiles":"CCCCCCCCCCCCCCCC(=O)O","pubchemCid":"985","sourceIds":["PubChem CID 985"]},{"id":"oleic-acid","name":"Oleic Acid","formula":"C18H34O2","category":"Common molecule","smiles":"CCCCCCCC/C=C\\CCCCCCCC(=O)O","pubchemCid":"445639","sourceIds":["PubChem CID 445639"]},{"id":"stearic-acid","name":"Stearic Acid","formula":"C18H36O2","category":"Common molecule","smiles":"CCCCCCCCCCCCCCCCCC(=O)O","pubchemCid":"5281","sourceIds":["PubChem CID 5281"]},{"id":"ascorbic-acid","name":"Ascorbic Acid","formula":"C6H8O6","category":"Common molecule","smiles":"C([C@@H]([C@@H]1C(=C(C(=O)O1)O)O)O)O","pubchemCid":"54670067","sourceIds":["PubChem CID 54670067"]},{"id":"riboflavin","name":"Riboflavin","formula":"C17H20N4O6","category":"Common 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molecule","smiles":"CC(=O)NC1=CC=C(C=C1)O","pubchemCid":"1983","sourceIds":["PubChem CID 1983"]},{"id":"ibuprofen","name":"Ibuprofen","formula":"C13H18O2","category":"Common molecule","smiles":"CC(C)CC1=CC=C(C=C1)C(C)C(=O)O","pubchemCid":"3672","sourceIds":["PubChem CID 3672"]},{"id":"naproxen","name":"Naproxen","formula":"C14H14O3","category":"Common molecule","smiles":"C[C@@H](C1=CC2=C(C=C1)C=C(C=C2)OC)C(=O)O","pubchemCid":"156391","sourceIds":["PubChem CID 156391"]},{"id":"ethane","name":"Ethane","formula":"C2H6","category":"Common molecule","smiles":"CC","pubchemCid":"6324","sourceIds":["PubChem CID 6324"]},{"id":"pentane","name":"Pentane","formula":"C5H12","category":"Common molecule","smiles":"CCCCC","pubchemCid":"8003","sourceIds":["PubChem CID 8003"]},{"id":"hexane","name":"Hexane","formula":"C6H14","category":"Common molecule","smiles":"CCCCCC","pubchemCid":"8058","sourceIds":["PubChem CID 8058"]},{"id":"heptane","name":"Heptane","formula":"C7H16","category":"Common 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molecule","smiles":"CCCCCCCCCCCCC","pubchemCid":"12388","sourceIds":["PubChem CID 12388"]},{"id":"tetradecane","name":"Tetradecane","formula":"C14H30","category":"Common molecule","smiles":"CCCCCCCCCCCCCC","pubchemCid":"12389","sourceIds":["PubChem CID 12389"]},{"id":"pentadecane","name":"Pentadecane","formula":"C15H32","category":"Common molecule","smiles":"CCCCCCCCCCCCCCC","pubchemCid":"12391","sourceIds":["PubChem CID 12391"]},{"id":"hexadecane","name":"Hexadecane","formula":"C16H34","category":"Common molecule","smiles":"CCCCCCCCCCCCCCCC","pubchemCid":"11006","sourceIds":["PubChem CID 11006"]},{"id":"heptadecane","name":"Heptadecane","formula":"C17H36","category":"Common molecule","smiles":"CCCCCCCCCCCCCCCCC","pubchemCid":"12398","sourceIds":["PubChem CID 12398"]},{"id":"octadecane","name":"Octadecane","formula":"C18H38","category":"Common molecule","smiles":"CCCCCCCCCCCCCCCCCC","pubchemCid":"11635","sourceIds":["PubChem CID 11635"]},{"id":"nonadecane","name":"Nonadecane","formula":"C19H40","category":"Common molecule","smiles":"CCCCCCCCCCCCCCCCCCC","pubchemCid":"12401","sourceIds":["PubChem CID 12401"]},{"id":"eicosane","name":"Eicosane","formula":"C20H42","category":"Common molecule","smiles":"CCCCCCCCCCCCCCCCCCCC","pubchemCid":"8222","sourceIds":["PubChem CID 8222"]},{"id":"ethene","name":"Ethene","formula":"C2H4","category":"Common molecule","smiles":"C=C","pubchemCid":"6325","sourceIds":["PubChem CID 6325"]},{"id":"propene","name":"Propene","formula":"C3H6","category":"Common molecule","smiles":"CC=C","pubchemCid":"8252","sourceIds":["PubChem CID 8252"]},{"id":"1-butene","name":"1-Butene","formula":"C4H8","category":"Common molecule","smiles":"CCC=C","pubchemCid":"7844","sourceIds":["PubChem CID 7844"]},{"id":"1-pentene","name":"1-Pentene","formula":"C5H10","category":"Common molecule","smiles":"CCCC=C","pubchemCid":"8004","sourceIds":["PubChem CID 8004"]},{"id":"1-hexene","name":"1-Hexene","formula":"C6H12","category":"Common molecule","smiles":"CCCCC=C","pubchemCid":"11597","sourceIds":["PubChem CID 11597"]},{"id":"1-heptene","name":"1-Heptene","formula":"C7H14","category":"Common molecule","smiles":"CCCCCC=C","pubchemCid":"11610","sourceIds":["PubChem CID 11610"]},{"id":"1-octene","name":"1-Octene","formula":"C8H16","category":"Common molecule","smiles":"CCCCCCC=C","pubchemCid":"8125","sourceIds":["PubChem CID 8125"]},{"id":"1-nonene","name":"1-Nonene","formula":"C9H18","category":"Common molecule","smiles":"CCCCCCCC=C","pubchemCid":"31285","sourceIds":["PubChem CID 31285"]},{"id":"1-decene","name":"1-Decene","formula":"C10H20","category":"Common molecule","smiles":"CCCCCCCCC=C","pubchemCid":"13381","sourceIds":["PubChem CID 13381"]},{"id":"cyclohexene","name":"Cyclohexene","formula":"C6H10","category":"Common molecule","smiles":"C1CCC=CC1","pubchemCid":"8079","sourceIds":["PubChem CID 8079"]},{"id":"isobutylene","name":"Isobutylene","formula":"C4H8","category":"Common molecule","smiles":"CC(=C)C","pubchemCid":"8255","sourceIds":["PubChem CID 8255"]},{"id":"acetylene","name":"Acetylene","formula":"C2H2","category":"Common molecule","smiles":"C#C","pubchemCid":"6326","sourceIds":["PubChem CID 6326"]},{"id":"propyne","name":"Propyne","formula":"C3H4","category":"Common molecule","smiles":"CC#C","pubchemCid":"6335","sourceIds":["PubChem CID 6335"]},{"id":"1-butyne","name":"1-Butyne","formula":"C4H6","category":"Common molecule","smiles":"CCC#C","pubchemCid":"7846","sourceIds":["PubChem CID 7846"]},{"id":"1-pentyne","name":"1-Pentyne","formula":"C5H8","category":"Common molecule","smiles":"CCCC#C","pubchemCid":"12309","sourceIds":["PubChem CID 12309"]},{"id":"1-hexyne","name":"1-Hexyne","formula":"C6H10","category":"Common molecule","smiles":"CCCCC#C","pubchemCid":"12732","sourceIds":["PubChem CID 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