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In the title compound, C 20 H 15 N 3 O 2 ·C 18 H 15 OP, the pyrimidinone heterocycle and the fused phenyl ring are inclined at 1.92 (7)°. Only the hy­droxy group is involved in hydrogen bonding, whereas the amino group is shielded from potential acceptors.

2-Anilino-3-(2-hydroxyphenyl)quinazolin-4(3H)-one–triphenylphosphine oxide (1/1)