| http://www.w3.org/ns/prov#value | - (18) the compound according to (14) wherein R1 is a group represented by the formula: ???Y1???Y2???Y1???Ra wherein Y1 is single bond; Y3 is optionally substituted alkylene; Y2 is ???O???, ???NH???C(???O)???, or ???C(???O)???NH???; Ra is optionally substituted carbocyclic group or optionally substituted heterocyclic group; R2 is hydrogen;
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