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EP 2 155 698 A1

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(43) Date of publication: 24.02.2010 Bulletin 2010/08 (21) Application number: 07736572.4 (22) Date of filing: 20.03.2007

(51) International Patent Classification (IPC):  C07D 249/08(2006.01) A61P 35/04(2006.01) A61K 31/4196(2006.01) (86) International application number: PCT/IN2007/000112 (87) International publication number: WO 2008/090565 (31.07.2008 Gazette 2008/31)

(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: 22.01.2007 IN CH01482007 (71) Applicants: Natco Pharma Limited Hyderabad 500 033, Andhra Pradesh (IN) Kompella, Amala Kishan Road No. 2, Banjara Hills Hyderabad 500033, Andhra Pradesh (IN) Rachakonda, Sreenivas Hyderabad 500 033, Andhra Pradesh (IN) RAO, A., K., S. Andhra Pradesh (IN) Venkaiah Chowdary, Nannapaneni Hyderabad 500 033, Andhra Pradesh (IN)

(72) Inventors: KOMPELLA, Amala kishan Andhra Pradesh 500033 (IN) RACHAKONDA, Sreenivas Andhra Pradesh 500033 (IN) RAO, A., K., S. Andhra Pradesh 500033 (IN) VENKAIAH CHOWDARY, Nannapaneni Andhra Pradesh 500033 (IN) (74) Representative: Neilson, Martin Mark  Urquhart-Dykes & Lord LLP Tower North Central Merrion Way Leeds LS2 8PA Leeds LS2 8PA (GB)