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1) Compounds of the general formula I in which A represents
a) hydroxyl,b) branched or straight-chain C1-C5 alkoxy,c) branched or straight-chain hydroxy C1-C5 alkoxy,d) branched or straight-chain O—C1-C5 alkyl-(O—C1-C4 alkyl)n-O—C1-C4 alkyl,e) N(C1-C5 alkyl)2,f) NH2,g) N(H)-L,h) O-L ori) O—Z, G represents
a) hydroxyl,b) O—Z,b) branched or straight-chain O—C1-C5 alkyl,c) branched or straight-chain O—C2-C5 alkenyl,d) branched or straight-chain O—C1-C5 alkyl-(O—C1-C4 alkyl)n-O—C1-C4 alkyl,e) branched or straight-chain O—C2-C5 alkynyl orf) triphenylmethoxy, R1 and R2 represent
a) hydrogen,b) branched or straight-chain 18F—C1-C5 alkoxy,c) branched or straight-chain 18F—C1-C5 alkyl,d) branched or straight-chain 18F—C2-C5 alkenyl,e) branched or straight-chain 18F—C2-C5 alkynyl,f) hydroxyl,g) branched or straight-chain C1-C5 alkyl orh) branched or straight-chain C1-C5 alkoxy, alkyl being optionally interrupted by one or more O, S or N,with the proviso that one of the substituents R1 or R2 contains exactly one 18F isotope and the respective other substituent contains no 18F isotope, with the proviso that R1 is not hydrogen, L represents
a) branched or straight-chain C1-C5 alkyl,b) branched or straight-chain C2-C5 alkenyl,c) branched or straight-chain C1-C5 alkyl-(O-C1-C4 alkyl)n-O—C1-C4 alkyl ord) branched or straight-chain C2-C5 alkynyl, Z represents a metal cation equivalent, and where n=0, 1, 2 or 3.
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