Electronic Supporting Information Osmium(VI) Nitrido Complexes bearing Azole Heterocycles: A New Class of Antitumor Agents† Wen-Xiu Ni, a Wai-Lun Man, a Shek-Man Yiu, a Man Ho, a Myra Ting-Wai Cheung, a Chi-Chiu Ko, a Chi-Ming Che, b Yun-Wah Lam a, * and Tai-Chu Lau a, * a Institute of Molecular Functional Materials and Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong, China. b Department of Chemistry and Open Laboratory of Chemical Biology of the Institute of Molecular Technology for Drug Discovery and Synthesis, The University of Hong Kong, Pokfulam Road, Hong Kong, China. E-mail: yunwlam@cityu.edu.hk; bhtclau@cityu.edu.hk . Electronic Supplementary Material (ESI) for Chemical Science This journal is © The Royal Society of Chemistry 2012