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EP 2 016 066 A2

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(88) Date of publication A3: 24.01.2008 (43) Date of publication: 21.01.2009 Bulletin 2009/04 (21) Application number: 07762094.6 (22) Date of filing: 10.05.2007

(51) International Patent Classification (IPC):  C07D 333/12(2006.01) C07D 333/22(2006.01) C07D 333/20(2006.01) (86) International application number: PCT/US2007/068667 (87) International publication number: WO 2007/134168 (22.11.2007 Gazette 2007/47)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 10.05.2006 IN CH08282006 20.06.2006 US 805254 P 28.07.2006 US 820636 P (71) Applicants: Dr. Reddy's Laboratories Ltd. Hyderabad 500 016 (IN) Dr. Reddy's Laboratories, Inc. Bridgewater, NJ 08807 (US)

(72) Inventors: GUDIPATI, Srinivasalu Hyderabad, 500 072, Andhra Pradesh (IN) KATKAM, Srinivas Secundarabad, 500 057, Andhra Pradesh (IN) PITTA, Jaya Prakash Warangal, 506 003, Andhra Pradesh (IN) GANJI, Prasad Hyderabad, 500 072, Andhra Pradesh (IN) CHALLA, Nageswara Rao Hyderabad, 500 072, Andhra Pradesh (IN) (74) Representative: Müller-Boré & Partner Patentanwälte  Grafinger Strasse 2 81671 München 81671 München (DE)