Abstract
Two unique low molecular weight (531) compounds with both digoxin-like immunoreactivity and Na, K-ATPase inhibitory properties have been isolated from human plasma. One of these, digoxin-like substance 2, (DLIS-2), was studied by fast atom bombardment mass spectrometry and collisionally activated dissociation mass spectrometry/mass spectrometry. The fragment patterns were interpreted as being derived from a lysophosphatidyl serine containing a novel 19:4 fatty acid side chain. The molecular formula C25H42O9NP is consistent with these observations.
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