they included the alkaloid , arecoline , from the betel nut ( areca catechu l. ) , eugenol , from the betel vine ( piper belle l. ) , chlorogenic acid , from tobacco leaves ( nicotiana tabacum ) , quercetin , from fennel seeds ( foeniculus vulgare mill . ) and the ubiquitous transition metal mn2+ .
C0002062
alkaloid
C0003753
arecoline