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Clariscan (gadoterate meglumine) is a paramagnetic macrocyclic ionic contrast agent administered for magnetic resonance imaging. The chemical name for gadoterate meglumine is D-glucitol, 1-deoxy-1-(methylamino)-, [1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraaceto(4-)-.kappa.N1, .kappa.N4, .kappa.N7, .kappa.N10, .kappa.O1, .kappa.O4, .kappa.O7, .kappa.O10]gadolinate(1-)(1:1); it has a formula weight of 753.9 g/mol and empirical formula of C 23 H 42 O 13 N 5 Gd (anhydrous basis). The structural formula of gadoterate meglumine in solution is as follows: CAS Registry No. 92943-93-6 Clariscan Injection is a sterile, nonpyrogenic, clear, colorless to yellow, aqueous solution of 0.5 mmol/mL of gadoterate meglumine. Each + Plus Pak™ polymer bottle contains 50 mmol per 100 mL. No preservative is added. Each mL of Clariscan contains 376.9 mg of gadoterate meglumine, 0.25 mg of DOTA and water for injection. Clariscan has a pH of 6.5 to 8.0. The main physiochemical properties of Clariscan are provided below: Table 4: Physicochemical Properties Parameter Value Density @ 20°C 1.1753 g/cm 3 Viscosity @ 20°C 3.4 mPa∙s Viscosity @ 37°C 2.4 mPa∙s Osmolality 1350∙mOsm/kg water The thermodynamic stability constants for gadoterate (log K therm and log K cond at pH 7.4) are 25.6 and 19.3, respectively. Chemical Structure

Clariscan (gadoterate meglumine) is a paramagnetic macrocyclic ionic contrast agent administered for magnetic resonance imaging. The chemical name for gadoterate meglumine is D-glucitol, 1-deoxy-1-(methylamino)-, [1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraaceto(4-)-.kappa.N1, .kappa.N4, .kappa.N7, .kappa.N10, .kappa.O1, .kappa.O4, .kappa.O7, .kappa.O10]gadolinate(1-)(1:1); it has a formula weight of 753.9 g/mol and empirical formula of C 23 H 42 O 13 N 5 Gd (anhydrous basis). The structural formula of gadoterate meglumine in solution is as follows: CAS Registry No. 92943-93-6 Clariscan Injection is a sterile, nonpyrogenic, clear, colorless to yellow, aqueous solution of 0.5 mmol/mL of gadoterate meglumine. Each vial and pre-filled syringe contains 2.5 mmol per 5 mL, 5 mmol per 10 mL, 7.5 mmol per 15 mL and 10 mmol per 20 mL. No preservative is added. Each mL of Clariscan contains 376.9 mg of gadoterate meglumine, 0.25 mg of DOTA and water for injection. Clariscan has a pH of 6.5 to 8.0. The main physiochemical properties of Clariscan are provided below: Table 4: Physicochemical Properties Parameter Value Density @ 20°C 1.1753 g/cm 3 Viscosity @ 20°C 3.4 mPa.s Viscosity @ 37°C 2.4 mPa.s Osmolality 1350 mOsm/kg water The thermodynamic stability constants for gadoterate (log K therm and log K cond at pH 7.4) are 25.6 and 19.3, respectively. Chemical Structure

Iohexol is a nonionic radiographic contrast agent available as: OMNIPAQUE (iohexol) injection for intrathecal, intra-arterial, intravenous, oral, rectal, intraarticular, and body cavity use OMNIPAQUE (iohexol) oral solution for oral use The chemical name of iohexol is Bis(2,3-dihydroxypropyl)-5-[ N -(2,3-dihydroxypropyl)-acetamido]-2,4,6- triiodoisophthalamide with a molecular weight of 821.14 (iodine content 46.36%). Iohexol has the following structural formula: OMNIPAQUE injection is a sterile, pyrogen-free, colorless to pale yellow solution available in five concentrations of iodine: OMNIPAQUE 140 mg iodine/mL: Each mL contains 302 mg iohexol (providing 140 mg organically bound iodine) and the following inactive ingredients: 0.1 mg edetate calcium disodium and 1.21 mg tromethamine. OMNIPAQUE 180 mg iodine/mL: Each mL contains 388 mg iohexol (providing 180 mg organically bound iodine) and the following inactive ingredients: 0.1 mg edetate calcium disodium and 1.21 mg tromethamine. OMNIPAQUE 240 mg iodine/mL: Each mL contains 518 mg iohexol (providing 240 mg organically bound iodine) and the following inactive ingredients: 0.1 mg edetate calcium disodium and 1.21 mg tromethamine. OMNIPAQUE 300 mg iodine/mL: Each mL contains 647 mg iohexol (providing 300 mg organically bound iodine) and the following inactive ingredients: 0.1 mg edetate calcium disodium and 1.21 mg tromethamine. OMNIPAQUE 350 mg iodine/mL: Each mL contains 755 mg iohexol (providing 350 mg organically bound iodine) and the following inactive ingredients: 0.1 mg edetate calcium disodium and 1.21 mg tromethamine. OMNIPAQUE oral solution is a sterile, pyrogen-free, colorless to pale yellow solution available in two concentrations of iodine: OMNIPAQUE oral solution 9 mg iodine/mL: Each mL contains 19 mg iohexol (providing 9 mg organically bound iodine) and the following inactive ingredients: 0.1 mg edetate calcium disodium and 1.21 mg tromethamine. OMNIPAQUE oral solution 12 mg iodine/mL: Each mL contains 26 mg iohexol (providing 12 mg organically bound iodine) and the following inactive ingredients: 0.1 mg edetate calcium disodium and 1.21 mg tromethamine. The pH is adjusted between 6.8 and 7.7 with hydrochloric acid or sodium hydroxide. OMNIPAQUE injection and OMNIPAQUE oral solution contain no preservatives and no ingredient made from a gluten-containing grain (wheat, barley, or rye). OMNIPAQUE injection and OMNIPAQUE oral solution have the following physical properties: Table 21. Physicochemical Properties of OMNIPAQUE Dosage Form Concentration (mg iodine/mL) Osmolality By vapor-pressure osmometry. (mOsmol/kg water) Absolute Viscosity (cP) Specific Gravity 20°C 37°C 37°C Injection 140 322 2.3 1.5 1.164 180 408 3.1 2.0 1.209 240 520 5.8 3.4 1.280 300 672 11.8 6.3 1.349 350 844 20.4 10.4 1.406 Oral solution 9 38 1.1 0.8 1.011 12 45 1.1 0.8 1.014 OMNIPAQUE injection has osmolalities from approximately 1.1 to 3 times that of plasma (285 mOsmol/kg water) or cerebrospinal fluid (301 mOsmol/kg water) as shown in the above table and are hypertonic . OMNIPAQUE oral solution is hypotonic. Chemical Structure