| http://www.w3.org/ns/prov#value | - The compound represented by formula I: wherein the hatched segment represents an ?? bond, the solid triangle represents a ?? bond, the wavy segment represents an ?? or ?? bond, dashed lines represent a double bond or a single bond, R3 is a substituted heteroaryl radical, R1 and R2 are independently selected from the group consisting of hydrogen or a lower alkyl radical having up to six carbon atom
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