organic papers Acta Cryst. (2007). E63, o1021–o1022 doi:10.1107/S1600536807004011 Iqbal et al.  C 19 H 17 N 3 O 4 S o1021 Acta Crystallographica Section E Structure Reports Online ISSN 1600-5368 Ethyl 2-({5-[2-(benzoylamino)phenyl]-1,3,4-oxa- diazol-2-yl}sulfanyl)acetate Rashid Iqbal, a Saeeda Aziz, b Muhammad Naeem Ahmed, a Ghulam Qadeer b * and Wai-Yeung Wong c a Department of Chemistry, University of AJ & K, Camp Office H-8, Islamabad 45320, Pakistan, b Department of Chemistry, Quaid-I-Azam Univeristy, Islamabad 45320, Pakistan, and c Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, People’s Republic of China Correspondence e-mail: qadeerqau@yahoo.com Key indicators Single-crystal X-ray study T = 293 K Mean (C–C) = 0.004 A ˚ R factor = 0.045 wR factor = 0.125 Data-to-parameter ratio = 16.7 For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e. Received 19 December 2006 Accepted 25 January 2007 # 2007 International Union of Crystallography All rights reserved In the title compound, C 19 H 17 O 3 N 4 S, a substituted oxadiazole derivative and an important biologically active compound, electron delocalization in the oxadiazole ring is reflected in the C—N bond lengths. Comment 2,5-Disubstituted-1,3,4-oxadiazoles and their derivatives are of significant interest due to their chemotherapeutic history (Singh et al., 1997). Based on the diverse biological activities of the 2,5-disubstituted-1,3,4-oxadiazoles and their derivatives, we have designed and synthesized some novel oxadiazole derivatives. We report here the structure of the title compound, (I). In the molecule of (I) (Fig. 1), the bond lengths and angles are within normal ranges (Allen et al., 1987). Rings A (N2/N3/