2-Butenoic acid, 3-methyl-, dodecahydro-7-hydroxy-3,4a,8-trimethyl-2,5-dioxazuleno(6,5-b)furan-4-yl ester, (3S-(3alpha,3abeta,4beta,4aalpha,7beta,7abeta,7abeta, 8beta,9abeta))- 6805-36-3 Flexuosin B NSC 85248