Source:http://linkedlifedata.com/resource/umls/id/C0002482
MSH: Organic compounds containing the -CO-NH2 radical. Amides are derived from acids by replacement of -OH by -NH2 or from ammonia by the replacement of H by an acyl group. (From Grant & Hackh's Chemical Dictionary, 5th ed),CSP: organic compound derived from ammonia by substituting an acyl radical for hydrogen, or from an acid by replacing the OH group by NH2.