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

2003 ◽  
Vol 33 (4) ◽  
pp. 627-637 ◽  
Author(s):  
Gary J Lehr ◽  
Thomas L Barry ◽  
John D Franolic ◽  
Glenn Petzinger ◽  
Peter Scheiner
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