Patent ID: 7553615

Claim:
A test element for determining an analyte, comprising (i) a nicotinamide coenzyme-dependent enzyme or a substrate for such an enzyme, and (ii) a coenzyme comprising a compound of the following general formula (I) or a salt or a reduced form thereof: in which A=adenine or an analog thereof, T=O or S, U=OH, SH, BH 3 —, or BCNH 2 —, V=OH or a phosphate group, W=COOR, CON(R) 2 , COR, or CSN(R) 2 , in which R═H or C 1 -C 2 -alkyl X 1 , X 2 =O, CH 2 , CHCH 3 , C(CH 3 ) 2 , NH, or NCH 3 , Y=NH, S, O, or CH 2 , Z= a saturated or unsaturated carbocyclic or heterocyclic six-membered ring, and a residue C(R 4 ) 2 bound to the six-membered ring and to X 2 , where R 4 =H, F, or CH 3, wherein the six-membered ring and the pyrimidine residue are not linked by a glycosidic bond.