(6aR-cis)-6a,11a-Dihydro-6H-benzofuro(3,2-c)(1)benzopyran-3,9-diol 3,9-Dihydroxypterocarpan 61135-91-9 6H-Benzofuro(3,2-c)(1)benzopyran-3,9-diol, 6a,11a-dihydro-, (6aR-cis)-