| http://www.w3.org/ns/prov#value | - Process for preparing a compound of general formula I [0013] in which: [0014] R is a hydrogen atom or an optionally substituted C1-C10 alkyl, C2-C10 alkenyl or C6-C12 arylsulphonyl group, and [0015] R1 and R2, which may be identical or different, represent [0016] a hydrogen atom, [0017] a C1-C10 alkyl group optionally substituted with one or more optionally substituted aryl groups, or an optionall
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