(1S,5S,6R,9S,20R,E)-6-[(S)-isobutyl]-5-(tert-butyldimethylsilyloxy)-20-[2-(methylthio)ethyl]-2-oxa-11,12-dithia-7,19,22-triazabicyclo[7.7.6]docos-15-ene-3,8,18,21-tetraone

(2S,6R,9S,12R,13S)-12-[(S)-isobutyl]-13-(tert-butyldimethylsilyloxy)-6-[2-(methylthio)ethyl]-2-[(E)-4-(tritylthio)but-1-en-1-yl]-9-tritylthiomethyl-1-oxa-5,8,11-triazacyclopentadecane-4,7,10,15-tetraone

(S,E)-3-(4-methoxybenzyloxy)-7-(tritylthio)hept-4-enoic acid