| http://www.w3.org/ns/prov#value | - The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein A is cyclopentenyl, X is a direct bond, and R1 is heterocyclyl optionally substituted with 1-3 independent C1-4alkyl, NO2, COOH, or ???NH(C0-4alkyl)-aryl substituents.
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