| abstract |
A radiolabeled compound of formula (I): is described R1 and R2 are each independently selected from the group consisting of hydrogen, alkyl, hydroxy, alkoxy, halo, haloalkyl, carboxy, carbalkoxy and salts thereof; and A, B, C and D are each independently selected from the group consisting of a hydrogen and an electon withdrawing group, provided that at least one of A, B, C and D is [18] fluorine. |