prov:value
| - esters; wherein if B is N, then Z is 2, and if B is other than N, then Z is 1; X and Y are the same or different and are selected from the group consisting of hydrogen, cyano, C(O)OR, C(O)R, C1-20alkyl, and C1-20 alkoxy, and R is defined as above for any of R1 through R5; wherein at least one of R1, R2, R3, R4, and R
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