| http://www.w3.org/ns/prov#value | - R2, R3 and R4 is a methyl, one of said methyl groups being radiolabeled.The compound is Compound [11C]-2.The compound may be one wherein R5 is one or more substituents, each being independently selected from halide, nitro, amine, hydroxyl, C1-C10alkyl, C2-C6alkenyl, C2-C6alkynyl, C3-C6cycloalkyl, C1-C10alkoxy (???O???C1-C10alkyl), C6-C18aryl, C5-C10heteroaryl, C1-C10aralkyl, polyethylenglycol, C1-
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