There is provided a compound of Formula (I) wherein X, Y and Z are each independently of each other an optional linker group; R, is a ring system; R2 is selected from hydrocarbyl groups, oxyhydrocarbyl groups, cyano (CN), nitro (-NO2) and halogens; R3 and R4 are independently selected from H and hydrocarbyl, ring A and B are independently optionally further substituted.
提供了一个化合物的结构式(I),其中X、Y和Z分别独立地是一个可选的连接基团;R是一个环系统;R2从烃基团、氧烃基团、
氰基(CN)、硝基(-
NO2)和卤素中选择;R3和R4分别独立地从氢和烃基团中选择,环A和B分别独立地可进一步取代。