3d image of gallotannin skeletal formula

gallotannin hydrolysable tannin polymer gallic acid polyphenol monomer polyol carbohydrate digallic metabolism pyrogallol-type hydrochloric chestnut wood castanea sativa oak quercus robur petraea alba tara pods caesalpinia spinosa gallnuts infectoria rhus semialata myrobalan terminalia chebula sumac coriaria aleppo andricus kollari supplement biological activity bioactive healthy aging herbal medicine herbal phytochemical phytotherapy plant herb natural herbalism pharmacognosy pharmacopoeia molecule molecular formula skeletal structural structure 3d