Wiktionary
piperidinedione
n. (context chemistry English) Any derivative of piperidine with two ketone functional groups.
Wikipedia
Piperidinedione
Piperidinediones are a derivatives of piperidine with two ketone functional groups. There are six isomers, each of which has a molecular weight of 113.115 and a formula of CHNO. Piperidinediones form the core structure of a variety of pharmaceutical drugs.