Compound 4

methyl (R)-3-((2S,3S)-2-((S)-2-(((3S,6S,14R,14aS,Z)-3,6-di-tert-butyl-14-methyl-1,4,10-trioxododecahydropyrrolo[1,2-a][1,4,7,10]tetraazacyclododecin-7(8H)-ylidene)amino)-3,3-dimethylbutanamido)-3-phenylbutanamido)-3-(thiazol-2-yl)propanoate

From: The bottromycin epimerase BotH defines a group of atypical α/β-hydrolase-fold enzymes