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3,3-dimethyl-2H-[1,3]oxazolo[2,3-b]quinazolin-5-one

7-chloro-3,3-dimethyl-2H-[1,3]oxazolo[2,3-b]quinazolin-5-one

3,3,7-trimethyl-2,3,6,7-tetrahydro-oxazolo[3,2-a]pyrimidin-5-one

3,3-dimethyl-7-oxo-2,3,6,7-tetrahydro-5H-oxazolo[3,2-a]pyrimidine-5-carboxylic acid 2-diethylamino-ethylamide