6 methoxy 1 2 3 4 tetrahydronaphthalene July 8, 2019 16 32 64 128 6 7-dimethoxy-1 2 3 4-tetrahydroisoquinoline 6-ethyl-1 2 3 4-tetrahydroanthraquinone 6 7-dimethoxy-1-methyl-1 2 3 4-tetrahydroisoquinoline