| abstract |
Use of a compound of ** formula ** wherein: W is N or N + -O-; R1 and R5 are independently H, C1 to C6 alkyl, (C1 to C6 alkyl) oxy, uncle, (C1 to C6 alkyl) uncle, carboxy, carboxy (C1 to C6 alkyl), formyl, (C1 to C6 alkyl) carbonyl, (C1 to C6 alkyl) oxycarbonyl, (C1 to C6 alkyl) carbonyloxy, nitro, trihalomethyl, hydroxy, hydroxy (C1 to C6 alkyl), amino, (C1 to C6 alkyl) amino, di (C1 to C6 alkyl) amino, aminocarbonyl , halo, halo (C1 to C6 alkyl), aminosulfonyl, (C1 to C6 alkyl) sulfonylamino, (C1 to C6 alkyl) aminocarbonyl, di (C1 to C6 alkyl) aminocarbonyl, [NZ] - (C1 to C6 alkyl) carbonylamino, formyloxy, formamide, (C1 to C6 alkyl) ami-sulfonyl, di (C1 to C6 alkyl) aminosulfonyl, [N-Z] (C1 to C6 alkyl) sulfonylamino or cyano; or R1 and R5 together form a methylenedioxy group; R2 is H or a C1 to C18 hydrocarbyl group optionally substituted where up to three C atoms can eventually be replaced by N atoms. |