120881-21-2 6-Oxa-13,20-dithia-3,10,17,22,23,24-hexaazatetracyclo(17.2.1.15,8.112,15)tetracosa-1(21),5(24),12(23),19(22)-tetraene-2,9,16-trione, 7,11-dimethyl-4-(1-methylethyl)-18-(phenylmethyl)- Bistratamide B