Identification of acylated xanthone glycosides by liquid chromatography–atmospheric pressure chemical ionization mass spectrometry in positive and negative modes from the lichen Umbilicaria proboscidea

2003 ◽  
Vol 995 (1-2) ◽  
pp. 109-118 ◽  
Author(s):  
Tomáš Řezanka ◽  
Valery M. Dembitsky
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