Boc-Tyr-Gly-Gly-Phe-Leu-NHNH2

[(S)-1-[({[((S)-1-{(S)-1-[N'-(3-Amino-propionyl)-hydrazinocarbonyl]-3-methyl-butylcarbamoyl}-2-phenyl-ethylcarbamoyl)-methyl]-carbamoyl}-methyl)-carbamoyl]-2-(4-hydroxy-phenyl)-ethyl]-carbamic acid tert-butyl ester; compound with acetic acid

Nω-(Q-β-alanyl)enkephalin hydrazide