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Antagonists of the chemotactic and inflammatory lipoxygenase product leukotriene B4 (LTB4) have been potential drug development targets for several years. The tetrazole LY255283 is a competitive antagonist of the BLT2 receptor. It displaces radiolabeled LTB4 from guinea pig lung membrane, with an IC50 of about 100 nM. LY255283 exhibits IC50 values of ~950 nM and >10 µM at human recombinant BLT2 and BLT1 receptors, respectively. LY255283 inhibits eosinophil chemotaxis by 80% at a concentration of 10 µM, and inhibits the binding of radiolabeled LTB4 to eosinophil membranes with an IC50 of 260 nM. Formal Name: 1-[5-ethyl-2-hydroxy-4-[[6-methyl-6-(1H-tetrazol-5-yl)heptyl]oxy]phenyl]-ethanone. CAS Number: 117690-79-6. Molecular Formula: C19H28N4O3. Formula Weight: 360.5. Purity: >98%. Formulation: A crystalline solid. Solubility: DMF: 50 mg/ml, DMF:PBS (pH 7.2) (1:1): .1 mg/ml, DMSO: 30 mg/ml, Ethanol: 1 mg/ml. lambdamax: 213, 232, 276, 326 nm. SMILES: CCc1c(OCCCCCC(C)(C)c2nnn[nH]2)cc(O)cc1C(=O)C. InChi Code: InChI=1S/C19H28N4O3/c1-5-15-16(13(2)24)11-14(25)12-17(15)26-10-8-6-7-9-19(3,4)18-20-22-23-21-18/h11-12,25H,5-10H2,1-4H3,(H,20,21,22,23). InChi Key: VSDBVKWYFGKZPY-UHFFFAOYSA-N.