2-Butenoic acid, 2-methyl-, 2,3,3a,4,5,6,7,8,9,11a-decahydro-7,9-dihydroxy-10-methyl-3,6-bis(methylene)-2-oxocyclodeca(b)furan-4-yl ester 63549-62-2 Hydroxyisonobilin