A composition comprising a compound having the following general formula: ** Formula ** wherein R 1 is (a) an unsubstituted pyrimidinyl, pyridazinyl, or pyrazinyl, or (b) a substituted pyrimidinyl, pyridazinyl, or substituted pyrazinyl, wherein each pyrimidinyl, pyridazinyl, or substituted pyrazinyl has one or more substituents independently selected from (C2-C6) alkenyl, (C2-C6) alkenyloxy, (C1-C6) alkoxy, (C1-C6) alkyl, (C2-C6) alkynyl , (C2-C6) alkynyloxy, aryl, (C3-C6) cycloalkenyl, (C3-C6) cycloalkenyloxy, (C3-C6) cycloalkyl, (C3-C6) cycloalkoxy, halo, or halo (C1-C6) alkyl； R2 is H, (C2-C6) alkenyl, (C2-C6) alkenyloxy, (C1-C6) alkoxy, (C1-C6) alkyl, (C2-C6) alkynyl, (C2-C6) alkynyloxy, aryl, (C3 -C6) cycloalkenyl, (C3-C6) cycloalkenyloxy, (C3-C6) cycloalkyl, (C3-C6) cycloalkoxy, halo, or halo (C1-C6) alkyl； R3 is H, (C2-C6) alkenyl, (C2-C6) alkenyloxy, (C1-C6) alkoxy, (C1-C6) alkyl, (C2-C6) alkynyl, (C2-C6) alkynyloxy, aryl, (C3 -C6) cycloalkenyl, (C3-C6) cycloalkenyloxy, (C3-C6) cycloalkyl, (C3-C6) cycloalkoxy, halo, or halo (C1-C6) alkyl； R4 is H, (C2-C6) alkenyl, (C2-C6) alkenyloxy, (C1-C6) alkoxy, (C1-C6) alkyl, (C2-C6) alkynyl, (C2-C6) alkynyloxy, aryl, (C3 -C6) cycloalkenyl, (C3-C6) cycloalkenyloxy, (C3-C6) cycloalkyl, (C3-C6) cycloalkoxy, halo, or halo (C1-C6) alkyl； R5 is NO2, CN, or CO2R6, wherein R6>； = (C1-C3) alkyl； and n is 0, 1, 2, or 3.Una composición que comprende un compuesto que tiene la siguiente fórmula general:**Fórmula** en donde R1 es (a) un pirimidinilo, piridazinilo, o pirazinilo no sustituido, o (b) un pirimidinilo, piridazinilo, o pirazinilo sustituido, en donde cada pirimidinilo, piridazinilo, o pirazinilo sustituido tiene uno o más sustituyentes independientemente seleccionados de (C2-C6)alquenilo, (C2- C6)alqueniloxi, (C1-C6)alcoxi, (C1-C6)alquilo, (C2-C6)alquinilo, (C2-C6)alquiniloxi, arilo, (C3-C6)cicloalquenilo, (C3- C6)cicloalqueniloxi, (C3-C6)cicloalquilo, (C3-C6)cicloalcoxi, halo, o halo(C1-C6)alquilo； R2 es H, (C2-C6)alqu
