| http://www.w3.org/ns/prov#value | - A compound of formula (V) in which R3 is hydrogen can also be prepared in 2 steps: firstly, a compound of formula: ##STR13## in which Y is R1 SO2 or a protecting group such as Boc or Fmoc, after which the carbon chain is extended by one atom using known methods, then, if necessary, the protecting group is removed and a sulphonyl halide of formula R1 SO2 Hal is reacted and, lastly, the group R' is
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