1-((3,4-Dimethoxyphenyl)methyl)-3,4-dihydro-6,7-dimethoxyisoquinoline 3,4-Dihydropapaverine 57543-00-7 5884-22-0 6957-27-3 EINECS 230-148-3 NSC 66154 PAPAVERINE, DL-3,4-DIHYDRO