Source:http://linkedlifedata.com/resource/umls/id/C0029224
MSH: A broad class of substances containing carbon and its derivatives. Many of these chemicals will frequently contain hydrogen with or without oxygen, nitrogen, sulfur, phosphorus, and other elements. They exist in either carbon chain or carbon ring form.,CSP: broad class of substances containing carbon and its derivatives; many of these chemicals will frequently contain hydrogen with or without oxygen, nitrogen, sulfur, phosphorus, and other elements.,NCI: Molecule that contains atoms of the element carbon, usually combined with itself and with atoms of one or more other element such as hydrogen, oxygen, nitrogen, sulfur, phosphorus, chlorine, or fluorine. Excludes carbides, carbonates and carbon oxides. (from EPA Terminology Reference System)