1. Inorganic and Physical Chemistry Division, CSIR – Indian Institute of Chemical Technology (IICT), Uppal Road, Tarnaka, Hyderabad, Andhra Pradesh 500607, India, Fax: +91‐40‐27160921
2. Laboratory of X‐ray Crystallography, CSIR–IICT, Hyderabad, India
3. Chemical Biology Division, CSIR–IICT, Hyderabad, India
4. Centre for Nuclear Magnetic Resonance, CSIR–IICT, Hyderabad, India