| http://www.w3.org/ns/prov#value | - [18] the compound according to [14] wherein R1 is a group represented by the formula: ???Y_???Y2???Y3???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; R1 is hydrogen; R3 is alkyl, halogen or a group represented by the formula:
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