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. 2013 Aug 14;2(1):117–126. doi: 10.3109/21556660.2013.833099

Figure 3.

Figure 3.

Mass spectra evaluation of M3 isolated from urine after oral administration of 15 mg 14C-4-aminopyridine to four human subjects. (A) Precursor electrospray ionization spectrum. (B) Product ion scan of m/z 189 ion of component M3.