5,7-dihydro-6-phenyl-1,3-di-n-propylpyrrolo<3,4-d>pyrimidine-2,4(1H,3H)-dione
4-ethoxy-5,7-dihydro-6-phenylpyrrolo<4,3-d>pyrimidin-2(1H)-one
(4-Cyano-1-phenyl-2,5-dihydro-1H-pyrrol-3-yl)-carbamic acid ethyl ester
5,7-dihydro-6-phenylpyrrolo<3,4-d>pyrimidine-2,4(1H,3H)-dione
4-amino-1-phenyl-2,5-dihydro-pyrrole-3-carbonitrile