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organic compounds
The two independent molecules of C21H23N5O3 in the asymmetric unit of the title compound possess similar conformations. In each molecule, an almost planar purine ring is fused to a reduced pyrimidine ring. The dihedral angles between the fused-ring plane and phenyl-ring plane of the molecules are different [115.5 (2)° for molecule (1) and 68.0 (1)° for molecule (2)]. The O14O13 distances of 2.478 (5) Å for molecule (1) and 2.467 (5) Å for molecule (2) indicate the presence of intramolecular hydrogen bonding.