| http://www.w3.org/ns/prov#value | - Esters of compounds of formula (I) wherein R1 is benzoyl, alkanoyl or --CO--(CH2)p --NR4 R5 are readily prepared by reacting forumla (I) compounds wherein R1 is hydrogen with benzoic acid, the appropriate alkanoic acid or acid of formula HOOC--(CH2)p --NR4 R5 in the presence of a condensing agent such as dicyclohexylcarbodiimide.
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