prov:value
| - X1-X6 are independently H, C1-C12 alkyl, (CH2)nOH, COOR, SO2R, OR1, Cl, phenyl, ???C(W)R7 or -L-G-CH???C(COOR1)(CN) provided R is C1-C12 alkyl, R1 is H or C1-C12 alkyl, n is an integer ranging from about 2 to about 8, R7 is C1-C12 alkyl, phenyl or phenalkyl and W is O or S;
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