1,2-bis(4-hydroxybutyl)-6-{[2-(2-hydroxyethoxy)ethyl][3-(4-nitrophenyl)acryloyl]amino}-4-{[(4-nitrobenzyl)oxy]imino}-6a-(prop-2-en-1-yloxy)-1,2,4,5,6,6a,11b,11c-octahydrobenzo[kl]xanthen-10-yl (2,4-dimethoxyphenyl)carbamate