label: 23h,25h-benzo(b)porphine-9,13-dipropanoic acid, 18-ethenyl-4,4a-dihydro-3,4-bis(methoxycarbonyl)-4a,8,14,19-tetramethyl-, .alpha.13-methyl ester, trans-
label_lc: 23h,25h-benzo(b)porphine-9,13-dipropanoic acid, 18-ethenyl-4,4a-dihydro-3,4-bis(methoxycarbonyl)-4a,8,14,19-tetramethyl-, .alpha.13-methyl ester, trans-