NOVEL BICYCLIC PYRIMIDIN-5-ONE DERIVATIVES. Novel 5H-thiazolo- and 5H-1,3,4-thiadiazolo¢3,2-a!-pyrimidin-5-one and 3,4-dihydro-2H,6H-pyrimido¢2,1-b! ¢1,3!-thiazin-6 one derivatives, which compounds are useful psychotropic agents.
BICYCLIC PYRIMIDIN-5-ONE DERIVATIVES