(12S,22Z,32Z,52S,122Z,8R,11S,15S)-8-benzyl-15-isobutyl-11-methyl-7,10,14-triaza-3(2,4)-oxazola-2,12(2,4)-dithiazola-1(2,1),5(1,2)-dipyrrolidinacyclohexadecaphane-4,6,9,13,16-pentaone

(1'S)-2-(1-{[2-(1'-tert-butoxycarbonylamino-ethyl)-thiazole-4-carbonyl]-amino}-ethyl)-thiazole-4-carboxylic acid ethyl ester

(S)-2-(1-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)ethyl)thiazole-4-carboxylic acid