Patent ID: 7655665

Claim:
A derivative of the following formula, or an agriculturally acceptable salt thereof, wherein R 1 represents a substituted or unsubstituted 5- or 6-membered heterocyclyl containing nitrogen, oxygen and/or sulfur, wherein the substituents are one to three substituents selected from the group consisting of a halogen atom, C 1-4 haloalkyl and C 1-4 haloalkoxyl; R 2 represents a hydrogen atom, a saturated or unsaturated C 1-8 hydrocarbyl group, a saturated or unsaturated C 1-8 halogenated hydrocarbyl group, —CH 2 CH 2 OCH 2 CH 3 , —CH 2 CH 2 OCH 3 , a substituted or unsubstituted phenyl group, a substituted or unsubstituted benzyl group, a substituted or unsubstituted C 1-8 alkoxyl group which is saturated or unsaturated, wherein the substituents are one to three substituents selected from the group consisting of halogen, C 1-4 haloalkyl and C 1-4 haloalkoxyl; or R 2 represents a group of the following formula: wherein Ra represents a methyl group, a trifluoromethyl group or a phenyl group; Rb represents a methyl group, a trifluoromethyl group, a pyridyl group, a phenyl group or a phenyl group substituted with a halogen atom and/or a nitro group; R 3 and R 4 independently represents a hydrogen atom, a substituted or unsubstituted C 1-3 alkyl group, wherein the substituents are one to three substituents selected from the group consisting of a halogen atom, C 1-4 haloalkyl and C 1-4 haloalkoxyl; A represents O, S or N; and n represents 0 or 1.