Key indicators: single-crystal X-ray study; T = 153 K; mean (C-C) = 0.002 Å; R factor = 0.032; wR factor = 0.082; data-to-parameter ratio = 13.2.In the title compound, C 15 H 17 N 3 O 2 S, all bond lengths and angles are normal. Intramolecular N-HÁ Á ÁN hydrogen bonding influences the molecular conformation. The benzene and phenyl rings make a dihedral angle of 75.80 (2) . In the crystal structure, weak intermolecular C-HÁ Á ÁO hydrogen bonds link the molecules into zigzag chains extended along the b axis. Related literatureFor a related crystal structure, see: Henschel et al. (1996). For applications of sulfonimide derivatives, see: Kamoshita et al. (1987) and Zhang et al. (2007). Experimental Crystal data C 15 H 17 N 3 O 2 S M r = 303.38 Monoclinic, C2=c a = 16.297 (3) Å b = 8.9962 (18) Å c = 20.314 (4) Å = 99.28 (3) V = 2939.3 (10) Å 3 Z = 8 Mo K radiation = 0.23 mm À1 T = 153 (2) K 0.47 Â 0.43 Â 0.20 mm Data collection Rigaku R-AXIS RAPID IP area-detector diffractometer Absorption correction: multi-scan (ABSCOR; Higashi, 1995) T min = 0.901, T max = 0.956 11196 measured reflections 2583 independent reflections 2470 reflections with I > 2(I) R int = 0.014