prov:value
| - R8 and R9 are identical or different and are --OR5, --NHR5, --NR17 R18 or one of the two groups ##STR11## in which R10 is a hydrogen atom, a C1 -C12 -alkyl group, a C5 -C7 -cycloalkyl group, a C7 -C9 -aralkyl group, a C8 -C18 -alkanoyl group, a C3 -C5 -alkenoyl group or a benzoyl group, or is ##STR12## R11, R12 and R13 are identical or different and are a C1 -C12 -alkylene group, a C5 -C13 -cycloa
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