Flecainide Impurity DFlecainide 2,5-bis(2,2,2-trifluoroethoxy)benzoic acid

Flecainide Impurity B dihydrochlorideFlecainide (RS)-2-aminomethylpiperidine dihydrochloride

Flurbiprofen Impurity AFlurbiprofen (RS)-2-(biphenyl-4-yl)propanoic acid

Guaifenesin Impurity DGuaifenesin 1,3-bis(2-methoxyphenoxy)propan-2-ol

Guaifenesin Impurity BGuaifenesin 2-(2-methoxyphenoxy)propane-1,3-diol

Guaifenesin Impurity AGuaifenesin 2-methoxyphenol

doxylamine-N-oxide oxalateDoxylamine doxylamine-N-oxide oxalate

Doxylamine Impurity A sesquisuccinateDoxylamine N,N-dimethyl-2-((1RS)-1-phenyl-1-(pyridin-4-yl)ethoxy)ethanamine sesquisuccinate

Doxylamine Impurity B HydrochlorideDoxylamine (RS)-1-phenyl-1-(pyridin-2-yl)ethanol hydrochloride

Doxylamine Impurity DDoxylamine phenyl(pyridin-2-yl)methanone