Provide a kind of compound with public formula (I): wherein R2 is selected from-C1 ,-Br and-CN R1 and R4 are independently selected from H and-F R631, R632, R641 and R642 are independently selected from-H ,-F and substituted or unsubstituted C1-C3 alkyl R651 and R652 is independently selected from H and substituted or unsubstituted C1-C3 alkyl and substituted or unsubstituted phenyl groups Wherein at least one of R631, R632, R641, R642 and R652 are not-H, or in which when all R631, R632, R641, R642 and R652 are-H, and R651 is not Me or Et.
