6-Oxa-13,20-dithia-3,10,17,22,23,24-hexaazatetracyclo(17.2.1.15,8.112,15)tetracosa-5(24),12(23),19(22)-triene-2,9,16-trione, 7,11-dimethyl-4-(1-methylethyl)-18-(phenylmethyl)-, (4S-(4R*,7S*,8R*,11R*,18R*))-