| http://www.w3.org/ns/prov#value | - a???2) converting the resultant compound of formula (I) wherein R1 is hydrogen atom into another compound of formula (I) wherein R1 is an optionally substituted group selected from alkyl, cycloalkyl, alkenyl, alkynyl, heterocyclyl, aryl, heterocyclyloxy-alkyl and alkoxycarbonyl;
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