| http://www.w3.org/ns/prov#value | - nts a hydrogen atom, an alkyl radical which may be substituted with a ???CN radical or with an amino group, a 4???-aminophenyl radical, or forms with R12 a heterocycle optionally containing oxygen and/or nitrogen, which may be substituted with a C1-C4 alkyl radical, R14 and R15, which may be identical or different, represent a hydrogen atom, a halogen atom such as bromine, chlorine, iodine or fluo
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