Key indicators: single-crystal X-ray study; T = 273 K; mean (C-C) = 0.003 Å; R factor = 0.040; wR factor = 0.117; data-to-parameter ratio = 12.8.The title compound, C 20 H 17 NO 6 , was synthesized by the reaction of syringaldehyde with hippuric acid. The molecule adopts a Z configuration about the central olefinic bond. The two benzene rings and the oxazolone ring are almost coplanar. The crystal structure is stabilized by weak intermolecular C-HÁ Á ÁO hydrogen bonds.
Experimental
Crystal dataC 20 H 17 NO 6 M r = 367.35 Triclinic, P1 a = 8.8400 (13) Å b = 10.4431 (15) Å c = 10.9693 (16) Å = 111.074 (6) = 96.544 (6) = 102.119 (6) V = 903.7 (2) Å 3 Z = 2 Mo K radiation = 0.10 mm À1 T = 273 (2) K 0.15 Â 0.12 Â 0.10 mm Data collection Bruker SMART CCD area-detector diffractometer Absorption correction: multi-scan (SADABS; Sheldrick, 1996) T min = 0.985, T max = 0.990 10391 measured reflections 3176 independent reflections 2244 reflections with I > 2(I) R int = 0.028