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Preparation method for 1-phenyl-2,6-bis(2-hydroxyethyl)imidazo[1,5-c]quinazoline-3,5-dione and 1-phenyl-2,6-bis(2-hydroxypropyl)imidazo[1,5-c]quinazoline-3,5-dione
Preparation method for 1-phenyl-2,6-bis(2-hydroxyethyl)imidazo[1,5-c]quinazoline-3,5-dione and 1-phenyl-2,6-bis(2-hydroxypropyl)imidazo[1,5-c]quinazoline-3,5-dione