Glossary – phytochemistry (under construction)

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O-glycosyl – when the sugar is attached to the aglycone by a -O- bond, easy to hydrolyze

Oleanolic acid – a triterpenoid related to betulinic acid

Oleoside – type of secoiridoid monoterpene

Orobanchoside (orobanchin) – a phenylpropanoid, an ester of caffeic acid, two molecules and two sugar molecules also being involved