3H-Bis(1)benzopyrano(3,4-b:6',5'-e)pyran-7(7aH)-one, 13,13a-dihydro-9,10-dimethoxy-3,3-dimethyl-, (7aS,13aS)- 3H-Bis(1)benzopyrano(3,4-b:6',5'-e)pyran-7(7aH)-one, 13,13a-dihydro-9,10-dimethoxy-3,3-dimethyl-, (7aS-cis)- 522-17-8 Deguelin