8H-7,10-Methanocyclopropa[18,19][1,10,3,6]dioxadiazacyclononadecino[11,12-b]quinoxaline-8-carboxylic acid, 5-(1,1-dimethylethyl)-1,1a,3,4,5,6,9,10,20,21,22,22a-dodecahydro-14-methoxy-3,6-dioxo-, methyl ester, (1aR,5S,8S,10R,18E,22aR)-