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In the title compound, C 20 H 21 N 5 O 4 , the ring system containing the three fused rings is essentially planar (r.m.s. deviation for all 12 non-H atoms = 0.041 Å). The phenyl ring makes a dihedral angle of 54.41 (6)° with this ring system. The isopropyl group is disordered over two positions, with site-occupancy factors of 0.753 (9) and 0.247 (9). The structure is mainly stabilized by weak inter­molecular N—H⋯O and intra­molecular C—H⋯O hydrogen-bonding inter­actions and π–π inter­actions, with inter­planar distances of 3.415 (1) Å between adjacent furan ring centroids and 3.420 (1) Å between the benzene and pyrimidinone rings.

Ethyl 2-isopropylamino-6-methyl-8-oxo-3-phenyl-3H,8H-furo[2,3-d][1,2,4]triazolo[1,5-a]pyrimidine-7-carboxylate