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