3-Bromo-2,5-furandione5926-51-2100 % similar Citraconic anhydrides616-02-448 % similar Aconitic anhydride6318-55-444 % similar Trifluoromethylmaleic anhydride700-27-643 % similar Phenylmaleic anhydride36122-35-739 % similar Maleic anhydride108-31-633 % similar