1-Propene-1,2,3-tricarboxylic acid, cyclic 1,2-anhydride 2,5-Dihydro-2,5-dioxofuran-3-acetic acid 3-Furanacetic acid, 2,5-dihydro-2,5-dioxo- 6318-55-4 Aconitic anhydride EINECS 228-663-3 NSC 31662 cis-Aconitic acid anhydride cis-Aconitic anhydride