2'-[(26E)-26-ethylidene-29-(1-hydroxyethyl)-19-(1-hydroxy-1-methylethyl)-12-(1-methoxyethyl)-14,21,28,31-tetraoxo-10,17,24,34-tetrathia-6,13,20,27,30,35,36,37,38-nonaazahexacyclo[30.2.1.1~8,11~.1~15,18~.1~22,25~.0~2,7~]octatriaconta-1(35),2,4,6,8,11(38),1