(19)

(11)

EP 0 485 419 A1

(12)

(43) Date of publication: 20.05.1992 Bulletin 1992/21 (21) Application number: 90911303.0 (22) Date of filing: 31.07.1990

(51) International Patent Classification (IPC):  C07D 219/ 04( . ) C07D 219/ 10( . ) C07D 219/ 08( . ) (86) International application number: PCT/GB1990/001187 (87) International publication number: WO 1991/001974 (21.02.1991 Gazette 1991/05)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 01.08.1989 GB 19890017568 (71) Applicant: Trifree Limited Salisbury Wiltshire (GB)	(72) Inventors: MORTON, Oswald London NW6 7NY (GB) FROST, George, Thomas, Baxter Surrey GU1 4RU (GB) (74) Representative: Cockbain, Julian, Dr., et al  Frank B. Dehn & Co. Imperial House 15-19 Kingsway London WC2B 6UZ London WC2B 6UZ (GB)