| http://www.w3.org/ns/prov#value | - The compound of formula (III) may be prepared by reacting a compound of formula (II) in which R, R', R1 and R2 are defined above with a compound of formula X--(CH2)n' --R5 in which X is a labile group, for example chlorine or bromine, and n' and R5 are as defined above.
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