CAS Registry Number
[4] CAS RNs are generally serial numbers (with a check digit), so they do not contain any information about the structures themselves the way SMILES and InChI strings do.[5] A collection of almost 500 thousand CAS registry numbers are made available under a CC BY-NC license at ACS Commons Chemistry.Well-known chemicals may additionally be known via multiple generic, historical, commercial, and/or (black)-market names, and even systematic nomenclature based on structure alone was not universally useful.They offer a reliable, common and international link to every specific substance across the various nomenclatures and disciplines used by branches of science, industry, and regulatory bodies.Almost all molecule databases today allow searching by CAS Registry Number, and it is used as a global standard.
caffeineunique identification numberChemical Abstracts Servicechemical substancechemical databaseorganicinorganicmineralsisotopesalloysserial numberscheck digitSMILESCC BY-NC(black)-marketsystematic nomenclaturestructural formulamoduloStereoisomersracemic mixturesepinephrinephasescarbongraphitediamondLeishman stainmustard oilchemical elementschromiumhexavalent Cr(VI) speciesalcohol dehydrogenasesCanadian Centre for Occupational Health and SafetyUnited States National Library of MedicineEuropean chemical Substances Information SystemRoyal Society of ChemistryEnvironmental Risk Management AuthorityAcademic publishingBeilstein Registry NumberChemical file formatDictionary of chemical formulasEC numberInternational Union of Pure and Applied ChemistryList of CAS numbers by chemical compoundPubChemRegistration authorityUN numberWayback MachineAmerican Chemical SocietyWikidataformula