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(11)

EP 3 997 074 A1

(12)

(43) Date of publication: 18.05.2022 Bulletin 2022/20 (21) Application number: 20837895.0 (22) Date of filing: 09.07.2020

(51) International Patent Classification (IPC):  C07D 273/04(2006.01) (52) Cooperative Patent Classification (CPC): C07D 273/04 (86) International application number: PCT/IB2020/056457 (87) International publication number: WO 2021/005545 (14.01.2021 Gazette 2021/02)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 10.07.2019 IN 201921027683 (71) Applicant: Gharda Chemicals Limited Ratnagiri, Maharashtra 415722 (IN)

(72) Inventors: GHARDA, Keki Hormusji Mumbai- Maharashtra 400050 (IN) SHENOY, Diwakar K Ratnagiri- Maharashtra 415722 (IN) SHET, Laxminarayan S Ratnagiri- Maharashtra 415722 (IN) SAMANGADKAR, Yatin S Ratnagiri- Maharashtra 415722 (IN) SALVI, Manoj V Ratnagiri- Maharashtra 415722 (IN) (74) Representative: Linage González, Rafael  Jacobacci & Partners, S.L. Génova, 15 - 1° 28004 Madrid 28004 Madrid (ES)