prov:value
| - yl, nitro, cyano, and amino groups; or L is selected from the group consisting of the formula ???(CH2)kQ(CH2)t??? where k is 1, 2 or 3, t is 1, 2 or 3 and Q is O, Se, Se(O)g, SiE2 where E is lower alkyl, aryl, S(O)g where g is 0, 1 or 2, or NR; or L is selected from the group consisting of the formula ???(CH2)mT(CH2)n??? where m is 0, 1 or 2, n is 0, 1 or 2, T is a 3 to 6 membered carbocyclic or h
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