The chemical name determined according to the nomenclature rules agreed upon by the International Union of Pure and Applied Chemistry (IUPAC).

Chemical name determined according to the nomenclature rules agreed upon by Chemical Abstracts Service (CAS).

A non-systematic name. That is, the name is not recognised according to the rules of any formal (e.g. IUPAC) system of nomenclature. For example chloroform rather than trichloromethane.

A systematic name. That is, the name should be generated from the connection table and be reproducible but it is not known which formal rules of nomenclature are being followed.

Usually based on the class that the conventional (CAS or IUPAC) names derives from. For example the generic names acid or carboxylic acid may be used for ethanoic acid.

An abbreviation for a chemical name, for example Ser for serine or DMSO for dimethyl sulphoxide.