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EP 1 363 914 A1

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(43) Date of publication: 26.11.2003 Bulletin 2003/48 (21) Application number: 02711126.9 (22) Date of filing: 05.02.2002

(51) International Patent Classification (IPC)7: C07D 487/04, A61K 31/519 (86) International application number: PCT/IB0200/342 (87) International publication number: WO 0206/2799 (15.08.2002 Gazette 2002/33)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 05.02.2001 US 266595 P 10.07.2001 IN MA056901 (71) Applicant: Dr. Reddy's Laboratories Ltd. Hyderabad 500 016 (IN)

(72) Inventors: SAIBAL, Kumar Das,Dr. Reddy's Research Foundation Hyderabad 500 016 (IN) PURMA, Papi Reddy,Dr. Reddy's Research Foundation Hyderabad 500 016 (IN) AKELLA, Venkateswarlu,Dr. Reddy's Res. Foundation Hyderabad 500 016 (IN) RAMANUJAM, Rajagopalan,Dr. Reddy's Res. Found. Hyderabad 500 016 (IN) RANJAN, Chakrabarti,Dr. Reddy's Res. Foundation Hyderabad 500 016 (IN) LOHRAY, Braj Bhushan,Dr. Reddy's Res. Foundation Hyderabad 500 016 (IN) LOHRAY, Vidya Bhushan,Dr. Reddy's Res. Foundation Hyderabad 500 016 (IN) PARASELLI, Bheema Rao,Dr. Reddy's Res. Foundation Hyderabad 500 016 (IN) (74) Representative: Ebner von Eschenbach, Jennifer et al Ladas & Parry,Dachauerstrasse 37 80335 München 80335 München (DE)