R2 is a hydrogen atom, halogen atom, alkoxy group which may be substituted, alkylthio group which may be substituted or arylthio group which may be substituted; R3 is a branched alkyl group having 3 to 5 carbon atoms, an O-substituted oxycarbonyl group, an N-substituted aminocarbonyl group in which the N-substituted group may form a ring, or a substituted or unsubstituted heterocyclic ring having