Guaifenesin Impurities

Find here the secondary pharmaceutical standard of the native API Guaifenesin traceable to USP and PhEur.

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91277 1,3-Bis(2-methoxyphenoxy)-2-propanol pharmaceutical impurity standard 1,3-Bis(2-methoxyphenoxy)propan-2-ol Guaifenesin impurity D (PhEur) NSC 142122
PHR1136 Guaiacol Pharmaceutical Secondary Standard; Certified Reference Material 2-Methoxyphenol Catechol monomethyl ether Pyrocatechol monomethyl ether
PHR1543   Guaifenesin Impurity B Pharmaceutical Secondary Standard; Certified Reference Material 2-(2-Methoxyphenoxy)-1,3-propanediol 2-(2-Methoxyphenoxy)propane-1,3-diol 2-(2-methoxyphenoxy)-1,3-propanediol
G-022   Guaifenesin Impurity Mixture solution 0.5 - 1.0 mg/mL in acetonitrile ((each analyte)), certified reference material, ampule of 1 mL New  
79213 1,1′-Oxybis[3-(2-methoxyphenoxy)-2-propanol] pharmaceutical impurity standard Guaifenesin impurity C (PhEur)