prov:value
| - unsaturated alkyl, a hydroxyl, an alkoxy, an aryloxy, an aralkoxy, an ester, an amide, a sulfhydryl, an alkyl sulfide, an aryl sulfide, an alkyl sulfoxide, an aryl sulfoxide, an alkylsulfonyl, an arylsulfonyl, a keto, a thioketo, a cyano, and a nitro; when R1, R1a, R2, R2a, R3, R3a, R4 or R4a is an aryl, a saturated alkyl comprising an aryl substituent, or an unsaturated alkyl comprising an aryl s
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