4-(2,2-diethoxyethyl)-2-phenylpyrazolo[1,5-a]pyrimidin-7-one

4-(2-hydroxyethyl)-2-phenylpyrazolo[1,5-a]pyrimidin-7-one

3-bromo-4-ethyl-2-phenylpyrazolo[1,5-a]pyrimidin-7-one

4-ethyl-3-[(4-ethyl-7-oxo-2-phenylpyrazolo[1,5-a]pyrimidin-3-yl)disulfanyl]-2-phenylpyrazolo[1,5-a]pyrimidin-7-one

3-nitroso-2-phenyl-1H-pyrazolo[1,5-a]pyrimidin-7-one