15,19-Epoxy-3H-pyrido[2,1-c][1,4]oxaazacyclotricosine-1,7,20,21(4H,23H)-tetrone,8-ethyl-5,6,8,11,12,13,14,15,16,17,18,19,24,25,26,26a-hexadecahydro-5,19-dihydroxy-3-[2-[4-[[1-(3-hydroxypropyl)-1H-indol-5-yl]oxy]-3-methoxycyclohexyl]-1-methylethenyl]-14,16