| http://www.w3.org/ns/prov#value | - where T1 and T2 are independently reactive groups, such as a halide, preferably chloride, in the presence of a base e.g. N,N-diisopropylethylamine and a suitable solvent e.g. MeCN, suitably at room temperature, to provide a compound of formula (XV) where R6 is C(R)???CH2, followed by reaction with a compound of formula (XX):
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