prov:value
| - R3 is chosen from a hydrogen atom, halogen atoms such as a chlorine atom, C1???C4 alkyl radicals, a sulpho radical, a carboxyl radical, monohydroxy(C1???C4 alkyl) radicals, hydroxy(C1???C4 alkoxy) radicals, acetylamino(C1???C4 alkoxy) radicals, mesylamino(C1???C4 alkoxy) radicals, and carbamoylamino(C1???C4 alkoxy) radicals, and
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