Keywords: Phthalic-anhydride-3D-balls.png Ball-and-stick model of the phthalic anhydride molecule the anhydride of phthalic acid widely used in organic synthesis Derived from File Phthalimide-3D-balls png 2010-07-26 Jynto and Ben Mills Benzoic anhydrides Five-membered oxygen heterocycles Images by Jynto |