Patent ID: 8344140

Claim:
A compound having formula II wherein X 1 to X 4 are N, X 5 is C or N, R 1 is H, Hal, —OR′, —NHR′, C1-C12 alkyl, C1-C12alkoxy, C1-C12 alkanoyl, C2-C12 alkenyl, C2-C12 alkynyl, (C1-C12 alkoxy)carbonyl, or (C1-C12 alkylamino)carbonyl, wherein R′ is H or C1-C6 alkyl R2 is O, R 3 , R 4 are independently of each other H, formyl, iminomethyl, nitroso, C1-C12 alkyl, C1-C12 alkoxy, C1-C12 alkanoyl, or halosubstituted C1-C12 alkanoyl, R 5 is H, C 1 -C 12 alkyl, C 1 -C 12 alkoxy, C 1 -C 12 alkanoyl, C 2 -C 12 alkenyl, C 2 -C 12 alkynyl, (C 1 -C 12 alkoxy)carbonyl, or (C 1 -C 12 alkylamino)carbonyl, R 6 , R 7 are independently of each other straight-chain or branched C 1 -C 12 alkyl, which is unsubstituted or substituted by at least one CN, Hal, or NO 2 , or a group of the formula III —S 1 —Ar 1 —S 2 — 18 F III wherein S 1 and S 2 are independently of each other a single bond, a spacer unit, a straight-chain or branched C1-C12 alkyl, which is unsubstituted or substituted by at least one CN, Hal, or NO 2 , and wherein one or more of the non-adjacent CH 2 groups may independently be replaced by —O—, —CO—, —CO—O—, —O—CO—, —NR′—, —N═, —NR′—CO—, —CO—NR′—, —NR′—CO—O—, —O—CO—NR′—, —NR′—CO—NR′—, —CH═CH—, —C≡C—, —S—, —SO 3 R′—, —PR′—, or a five- or six-membered aromatic ring, which is unsubstituted or substituted with CN, Hal, NO 2 , COR′, or COOR′, wherein R′ represents H or C 1 -C 6 alkyl, or a combination thereof, and Ar 1 is a triazole or a tetrazole, with the proviso that one of R 6 and R 7 is a group of formula III, m is 0 or 1, P is 0, 1 or 2, and q has a value of 1 to 7.