prov:value
| - The preferred groups as R5 and R6 are a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, a sulfonyl group and an acyl group, more preferred groups are a hydrogen atom, an aryl group, a heterocyclic group, and a sulfonyl group, and most preferred groups are a hydrogen atom, an aryl group, and a heterocyclic group, provided that R5 and R6 do not represent a hydrogen atom at the sa
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