diketopiperazine

noun
di·​ke·​to·​pi·​per·​a·​zine | \ (ˌ)dī-ˌkēt-ō-pī-ˈper-ə-ˌzēn How to pronounce diketopiperazine (audio) \

Medical Definition of diketopiperazine

1 : a compound C4H6N2O2 that is obtainable from two molecules of glycine by dehydration and may be regarded as a cyclic dipeptide
2 : any of various cyclic compounds formed similarly to diketopiperazine from alpha-amino acids other than glycine or obtained by partial hydrolysis of proteins

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