prov:value
| - (a) at least one of X, Y, X???, Y???, X???, and Y??? is other than H, C1-6 alkyl, halogen, CF3, O???C1-6 alkyl, NO2, and NR2; (b) Z is other than H, C1-6 alkyl, OH, O???C1-6 alkyl, acetyloxy, and propionyloxy; or, (c) Q is other than H, C1-6 alkyl, (CH2)n-heteroaryl, and (CH2)n-aryl.
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