2-Butenoic acid, 2-methyl-, 5,6,7,8-tetrahydro-6-hydroxy-1,2,3,13-tetramethoxy-6,7-dimethylbenzo(3,4)cycloocta(1,2-f)(1,3)benzodioxol-5-yl ester, (5S-(5alpha(Z),6beta,7beta))- 58546-55-7 Gomisin B Schisandrer B Schisantherin B Schisantherin C