(R)-4-((((R)-2'-(aminomethyl)-4-methyl-4,5-dihydro-[2,4'-bithiazole]-4-carbonyl)-L-valyl)oxy)hex-5-enoic acid

2-((12Z,22Z,24R,5S,8S)-8-((E)-4-mercaptobut-1-en-1-yl)-24-methyl-3,6,10-trioxo-24,25-dihydro-7-oxa-4,11-diaza-1(4,2),2(2,4)-dithiazolacyclododecaphane-5-yl)acetic acid

(S)-3-((((R)-2'-(aminomethyl)-4-methyl-4,5-dihydro-[2,4'-bithiazole]-4-carbonyl)-L-valyl)oxy)pent-4-enoic acid compound with 2,2,2-trifluoroacetic acid (1:1)