Compound 3a

(R)-2-((R)-2-carboxy-1-((S)-2-((S)-2-(((3S,6S,14aS,E)-3,6-diisopropyl-1,4,10-trioxo-1,2,3,4,5,6,9,10,12,13,14,14a-dodecahydropyrrolo[1,2-a][1,4,7,10]tetraazacyclododecin-7-yl)amino)-3-methylbutanamido)-3-phenylpropanamido)ethyl)-4,5-dihydrothiazole-4-carboxylic acid

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