prov:value
| - roup containing from 7 to 13 carbon atoms, or a phenyl group unsubstituted or substituted by at least one alkyl group containing from 1 to 4 carbon atoms, or trifluoromethyl group, more preferably R4 is a hydrogen atom, or an alkyl group containing from 1 to 4 carbon atoms, or a decyl, benzyl, biphenylmethyl, 3-trifluoromethylphenyl, 3,5-di-tert-butylphenyl, 2-methylphenyl or phenyl group.
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