Page 1. Indian Journal of Chemistry Vol. ... Ahmedabad, 380015, India e-mail: hraj./ohray@ zyduscac7i/a.col1l Tel:027 17-3750607; Fax: 027 1"-3750606 Received 27 April 2001; accepted (revised) 30 July 2001 ... Page 3. 588 INDIAN 1. CHEM., SEC B, MARCH 2002 ...