| http://www.w3.org/ns/prov#value | - [15] the compound according to [14] wherein R1 is a group represented by the formula: ???Y1???Y2???Y3???Ra wherein Y1, Y3, and Ra are as defined in [14]; Y2 is ???O???, ???NRb???C(???O)??? or ???C(???O)???NRb???; Rb is hydrogen or optionally substituted alkyl;
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