prov:value
| - atom or an aliphatic group, more preferably a hydrogen atom, a fluorine atom, a chlorine atom, an alkyl group or a substituted alkyl group, particularly preferably a hydrogen atom, a chlorine atom, a C1???alkyl group or a C1-10 substituted alkyl group, and most preferably a hydrogen atom, a C1-4 alkyl group or a C1-4 substituted alkyl group. [0054] In the formula (I) above, R2 and R3, R3 and R4, R
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