prov:value
| - l and Rq and Rr are a hydrogen atom or are defined on the same way as Ro or Ro and Rq are together trimethylene or tetramethylene and Rp and Rr are a hydrogen atom, and Rs is a direct bond, --CH2 --, --C(CF3)2 --, 2,2-propylidene or --CO--, and in which the radical X' is selected from the group consisting of ##STR89## in which Ru is a direct bond, --O--, --CO--, --C(CF3)2 -- or --CH2 --, and Rt is
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