tannic acid, tannin molecule. it type of polyphenol. sheet of paper in a cage. structural chemical formula and molecule model

acid atom atomic cage carbon chemical chemistry compound corrosion education formula gall gallnut gallotannic hydrogen illustration model molecular molecule notebook oak organic polyphenol quercitannic quercitron science sheet sicilian spinosa structure study sumac tannate tannic tannicum tannin tannine tara vector