| 摘要 |
wherein one of R1 and R2 is a group of the Formula (a), wherein R4 is selected from H and hydrocarbyl, R 5 is a hydrocarbyl group and L is an optional linker group, or R 1 and R2 together form a ring substituted with the group (Formula (a)) wherein R3 is H or a substituent, and wherein X is selected from S, O, NR6 and C(R7)(R8), wherein R6 is selected from H and hydrocarbyl groups, wherein each of R7 and R8 are independently selected from H and hydrocarbyl groups.
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