Triazine benzoate compound and application thereof

A triazine benzoate compound of formula I and an optical isomer thereof:

• wherein:
• W is O or S;
• X1 is H or F;
• X2 is CONH2 or CSNH2;
• R1 is methyl or ethyl;
• R2 is methyl or ethyl;
• R3 is H or methyl;
• R4 is H or C1-C3 alkyl, with the proviso that R3 and R4 are not simultaneously H;
• R5 is selected from
• wherein phenyl, phenyl C1-C6 alkyl, alicyclic heterocycle, and aromatic heterocycle are optionally substituted by one or more of substituents selected from nitro, halogen, C1-C6 alkyl, C1-C6 haloalkyl, C1-C6 alkoxy, C1-C6 haloalkoxy, C3-C6 cycloalkyl, C3-C6 cycloalkoxy, C2-C6 alkenyl, C2-C6 alkynyl, phenyl, and phenyl substituted by one or more halogens.