(12Z,14R,22Z,7S)-14-methyl-7-((E)-4-(tritylthio)but-1-en-1-yl)-14,15-dihydro-8-oxa-4,12-diaza-1(2,4),2(4,2)-dithiazolacyclotridecaphane-5,9,13-trione

(5R,12S)-12-((E)-4-mercaptobut-1-en-1-yl)-5-methyl-11-oxa-3,18-dithia-7,15,20,21-tetraazatricyclo[15.2.1.1(2,5)]henicosa-1(19),2(21),17(20)-triene-6,10,14-trione