LC determination of impurities in methoxsalen drug substance: isolation and identification of isopimpinellin as a major impurity by atmospheric pressure chemical ionization LC/MS and NMR

Author： Lehr G.J.   Barry T.L.   Franolic J.D.   Petzinger G.   Scheiner P.  

Publisher： Elsevier

ISSN： 0731-7085

Source： Journal of Pharmaceutical and Biomedical Analysis, Vol.33, Iss.4, 2003-11, pp. : 627-637

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