prov:value
| - p; and Zg is a hydrogen atom, an optionally substituted C1-8 alkyl group, an optionally substituted C2-6 alkenyl group, an optionally substituted C2-6 alkynyl group, an optionally substituted C3-8 alicyclic hydrocarbon group, an optionally substituted C6-14 aryl group, an optionally substituted C6-14 aryl-C1-6 alkyl group, ???OR200, ???SR200, ???COR200, ???SO2R200 (wherein R200 is a hydrogen atom,
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