Ursodeoxycholic acid for system suitability

Ursolic acid

Valaciclovir for system suitability

Valaciclovir hydrochloride (anhydrous)

Valaciclovir impurity D - 2-[(2-amino-6-oxo-1,6dihydro-9H-purin-9-yl)methoxy]ethyl N-ethyl-L-valinate

Valaciclovir impurity E - 2-[(2-amino-6-oxo-1,6dihydro-9H-purin-9-yl)methoxy]ethyl N-[(benzyloxy)carbonyl]-L-valinate

Valaciclovir impurity F - para-toluenesulfonate 2-hydroxyethyl L-valinate

Valaciclovir impurity G - N,N-dimethylpyridin-4-amine

Valaciclovir impurity P - 2,2'-[Methylenebis[imino(6-oxo-1,6,dihydro-9H-purine-2,9-diyl)methyleneoxy]]diethyl di(L-valinate)

Valaciclovir impurity S - 2-[(2-Amino-6-oxo-1,6-dihydro-9H-purin-9-yl)methoxy]ethyl N-[(1,1-dimethylethoxy)carbonyl]-L-valinate