Polyquaternium 1 is an antimicrobial preservative used for rabbit ocular surface study on polyquad-preserved travoprost/timolol, benzalkonium chloride-preserved travoprost/timolol, and latanoprost/timolol in fixed combinations.Synonyms:Inert gasCAS Number:75345-27-6Molecular Formula:(C₆H₁₂ClN)n C₁₆H₃₆Cl₂N₂O₆Molecular Weight:2500Appearance:Supplied as a light brown solid.Purity:~90%Solubility:Methanol (Slightly, Heated), Water (Slightly)Method for Determinng Identity: Proton NMR (D2O) Spectroscopic Analysis and Mass Spectrometric AnalysisChloride Content:As ReportedStorage and Stability:Store at 4°C. Caution: Hygroscopic; store under inert atmosphere. Stable for 6 months after receipt. For maximum recovery of product, centrifuge the original vial prior to removing the cap.