1,5-diformyl-1,3,4,5-tetrahydro-7,8-dimethoxypyrrolo<4,3,2-de>quinoline

6-chloro-1,5-diformyl-1,2,2a,3,4,5-hexahydro-7,8-dimethoxypyrrolo<4,3,2-de>quinoline

6-chloro-5-formyl-1,3,4,5-tetrahydro-7,8-dimethoxy-1-phenylsulfonylpyrrolo<4,3,2-de>quinoline