139156-98-2 5,6-Trimethylene-4-phenylpyrrolo(3,2-d)pyrimidine 6H-Pyrimido(4,5-b)pyrrolizine, 7,8-dihydro-4-phenyl- 7,8-Dihydro-4-phenyl-6H-pyrimido(4,5-b)pyrrolizine BRN 5436621