(3R)-(4Z, 9Z, 15Z)-3-Cholesteryloxycarbonyl-methyl-17-ethyl-2,2,7,8,12,13,18-heptamethyl-1,19-dioxo-1,2,3,19,23,24-hexahydro-21H-bilin 以43%的产率得到(3R)-(4Z, 9Z, 15E)-3-Cholesteryloxycarbonyl-methyl-17-ethyl-2,2,7,8,12,13,18-heptamethyl-1,19-dioxo-1,2,3,19,23,24-hexahydro-21H-bilin