prov:value
| - where X2 is a heteroatom and independently groups R11, R12, or any of R14-17 can be H, or optional substituents including halogen, alkyl, aryl, alkenyl, alkynyl, heteroaryl, hydroxyl, alkoxy, polyalkylether, amino, alkylamino, dialkylamino, alkyloxyalkyl, sulfonate, aryloxy or heteroaryloxy; or independently R11, R12, or any of R14-17 can be H, optionally-substituted alkyl, alkenyl, alkynyl, aryl,
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