label: 2-methylbut-2-enoic acid 4-butyryloxy-6-ethoxy-3,3a-dihydroxy-3,6,9-trimethyl-2-oxododecahydroazuleno(4,5-b)furan-8-yl ester
label_lc: 2-methylbut-2-enoic acid 4-butyryloxy-6-ethoxy-3,3a-dihydroxy-3,6,9-trimethyl-2-oxododecahydroazuleno(4,5-b)furan-8-yl ester