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Pharmaceutical Impurity Reference Standards

Fountainbridge are experts in the custom synthesis of pharmaceutical impurity reference standards and metabolite reference standards. We have successfully synthesised a large number of impurities on scales of milligrams to hundreds of grams. We excel in challenging syntheses and all our materials come with a detailed certificate of analysis. Please search our products below or contact us to request a quote

4-Epi Doxycycline
(4R,4aR,5S,5aR,6R,12aS)-4-(Dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,5,10,12,12a-pentahydroxy-6-methyl-1,11-dioxo-2-naphthacenecarboxamide
6543-77-7

4-Epi Doxycycline is an impurity of doxycycline and can be used as an alternative to doxycycline to control gene expression

Purity >80%

Also possible to supply HCl salt (>85%)

Analysis NMR, HPLC, MS, melting point

Fountainbridge is a leading global supplier of custom synthesised pharmaceutical impurity reference standards. Please Contact Us for a custom synthesis quotation for these or any other products of interest.