19701-50-9 3,7,8,12b-Tetrahydrobenzo(6,7)cyclohept(1,2,3-de)isoquinoline-2(1H)-carboxaldehyde BRN 1350068 Benzo(6,7)cyclohept(1,2,3-de)isoquinoline-2(1H)-carboxaldehyde, 3,7,8,12b-tetrahydro-