1,2,3,4-Tetrahydro-6H-pyrimido(2,1-b)quinazolin-6-one 19801-37-7 6-Oxo-1,2,3,4-tetrahydro-6H-pyrimido(2,1-b)quinazoline 6H-Pyrimido(2,1-b)quinazolin-6-one, 1,2,3,4-tetrahydro-