| http://www.w3.org/ns/prov#value | - The compound of the formula (IV-1) can also be prepared by reacting a ketone of the formula: ##STR61## wherein Z2 and m are as defined above, with an ester of the formula: ##STR62## wherein R' is an alkyl group; and Z1 and m are as defined above, in the presence of Na, NaH, or a metal alkoxide to carry out a condensation reaction.
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