17322-84-8 19625-18-4 3,4,4a,5,6,6a-Hexahydro-3-methoxy-5-methyl-8H- (1,3)dioxolo(6,7)(2)benzopyrano(3,4-c)indol-8-ol (stereoisomer) Pretazettine Tazettine, 6a-deoxy-8-hydroxy-, (6abeta,8beta)-