| http://www.w3.org/ns/prov#value | - The amino group R4 R5 N-- is then introduced into the compound of formula (XIV) by reaction with an amine R4 R5 NH, in a suitable solvent such as ether, to give a compound of formula (XV) ##STR17## Introduction of the 3-hydroxymethyl group is effected by reduction of the 3-carboxylate using for example lithium aluminium hydride in a suitable solvent such as ether.
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