In O.
crenata, verbascoside was about 95% of TPC; moreover, isoverbas-
coside and another unidentified caffeic acid derivative were also
detected (Fig. 1a). The HPLC analysis of S. minor extract showed a
rich phenolic pattern. In particular, caffeic acid derivatives,
quercetin-3-glucoside, kaempferol-3-glucoside, and other querce-
tin, kaempferol, and luteolin derivatives, besides many other
unidentified compounds, were found (Fig. 1b).