| http://www.w3.org/ns/prov#value | - wherein R1 is a hydrogen atom or a substituent convertible in vivo to hydrogen; R2, R3 and R4 are independently a hydrogen or a substituent; and R8 is selected from the group consisting of (C1-3)alkyl, aryl(C1-3)alkyl, (C3-12)cycloalkyl, hetero(C3-12)cycloalkyl, heteroaryl(C1-3)alkyl, aryl and heteroaryl, each substituted or unsubstituted, or a salt thereof (hereinafter sometimes to be abbreviated
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