The spectrum in the negative ionization mode also showed two
deprotonated molecular ions at m/z 471.1510 (compounds 37 and
49) and a MS/MS fragment ion at m/z 193.0497, this latter ion may
be originated from the neutral loss of arabinose and xylose moieties
(−278 Da). Depending on the data obtained from QTOF–MS, together
with the accepted error, mSigma values, and data from the literature