(30S,18R,21R,24R,27R)-21,27-Bis(3,5-dichloro-4-hydroxyphenyl)-18-[2-(3,5-dichloro-4-hydroxyphenyl)-2-oxoacetylamino]-37-hydroxy-29-methyl-19,22,25,28-tetraoxo-2-oxa-14,20,23,26,29-pentaazahexacyclo[30.2.2.1<3,7