methyl (1Z)-N-({(12Z)-5-[(benzyloxy)methyl]-4,7,13-trimethyl-3,8-dioxido-10-oxo-2,9,11-trioxa-3lambda~4~,8lambda~4~,14-trithia-4,7,12-triazapentadec-12-enoyl}oxy)ethanimidothioate