prov:value
| - I???) below: in which: R19 represents a hydrogen atom, a C1-C4 alkoxy radical, a halogen atom such as bromine, chlorine, iodine or fluorine, or an amino radical, R20 represents a hydrogen atom, a C1-C4 alkyl radical or forms, with a carbon atom of the benzene ring, a heterocycle optionally containing oxygen and/or substituted with one or more C1-C4 alkyl groups, R21 represents a hydrogen atom or a
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