“…36 The 1 H NMR spectrum of fraction 1 was compared with the
spectrum from commercial reference compounds (Figures S14 and S15, Supporting Information) and were in agreement
with previously published data. 23,37,38 All identified metabolites were quantified in fraction 1 using 3,5-dinitrobenzoic
acid (Fluka, TraceCERT) as the internal calibrant (IC, 2.12 mM). By
far, 10 was the most abundant metabolite (71.7% in fraction
1, qHNMR, anomeric proton), followed by 11 (10.3% of
fraction 1, qHNMR, H-3 resonance), 12 (2.91% of fraction
1, qHNMR, H-3 resonance), and 13 (0.16% of fraction 1,
qHNMR, H-4 and H-6).…”