prov:value
| - epresents a hydrogen atom, a C1-C4 alkyl radical, a C1-C4 monohydroxyalkyl radical, a C2-C4 polyhydroxy-alkyl radical, a (C1-C4)alkoxy(C1-C4)alkyl radical or a C1-C4 alkyl radical substituted with a nitrogenous group; R3 represents a hydrogen atom, a halogen atom such as a chlorine atom, a C1-C4 alkyl radical, a sulfo radical, a carboxy radical, a C1-C4 monohydroxyalkyl radical, a C1-C4 hydroxyalk
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