Source:http://linkedlifedata.com/resource/umls/id/C0003376
MSH: Drugs that are chemically similar to naturally occurring metabolites, but differ enough to interfere with normal metabolic pathways. (From AMA Drug Evaluations Annual, 1994, p2033),CSP: drug that is chemically similar to a naturally occurring metabolite, but differs enough to interfere with normal metabolic pathways.,NCI: A drug that is very similar to natural chemicals in a normal biochemical reaction in cells but different enough to interfere with the normal division and functions of cells.,NCI: An antineoplastic agent with a structural similarity to a natural substance that can replace that substance in a normal biochemical pathway and interfere with the normal metabolic processes of cells.,NCI: An antimetabolite with an unknown or unspecified mechanism of action.