M r---58.08, tetragonal, P42/n, a = 10.964 (4), c = 5.701 (3) A, V--685.3 (6)/k 3, Z --8, Dx=l.126(1)Mgm -3, MoKct, 2 = 0. 71069 A, /t = 0.07 mm -1, F(000) = 256, T = 108 K. Final R = 0.038 for 1273 reflections. The nonhydrogen atoms and the hydrogens attached to the N atoms are virtually coplanar. The results indicate that the methyl group adopts two alternative orientations with almost equal occupancy. Semi-empirical force-field calculations verify that the methyl rotation barrier is very small. The molecules in the structure are connected by hydrogen bonds with the amino group as the hydrogen donor and the imino group as the acceptor.
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