(19)

(11)

EP 0 368 897 A1

(12)

(43) Date of publication: 23.05.1990 Bulletin 1990/21 (21) Application number: 88906362.0 (22) Date of filing: 15.06.1988

(51) International Patent Classification (IPC):  A01N 47/ 36( . ) C07D 521/ 00( . ) (86) International application number: PCT/US1988/001972 (87) International publication number: WO 1989/000994 (09.02.1989 Gazette 1989/04)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 31.07.1987 US 19870080471 04.05.1988 US 19880190242 04.05.1988 US 19880190243 (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US)	(72) Inventor: TSENG, Chi-Ping Wilmington, DE 19803 (US) (74) Representative: Hildyard, Edward Martin, et al  Frank B. Dehn & Co. European Patent Attorneys Imperial House 15-19 Kingsway London WC2B 6UZ London WC2B 6UZ (GB)