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In the title compound, C 11 H 12 ClN 5 O, the triazolone and pyrimidine rings are almost coplanar [dihedral angle = 2.98 (14)°]. The total puckering amplitude  Q T   of the seven-membered lactam ring is 0.706 (3) Å.

2-(2-Chloropyrimidin-4-yl)-3,5,6,7,8,9-hexahydro-2H-1,2,4-triazolo[4,3-a]azepin-3-one