| http://www.w3.org/ns/prov#value | - l group, to form a compound represented by general formula (IV):##STR00009## wherein R.sup.3 is as defined above;(b) treating said compound represented by general formula (IV) with a compound represented by general formula (V): ZCH.sub.2CO.sub.2R.sup.1 (V) wherein Z is a chlorine, bromine or iodine atom, and R.sup.1 is as defined above, to form a compoundrepresented by general formula (VI):##STR00
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