Succinic anhydride formula C4H4O3, the molecular structure of succinic anhydride (CAS 108 - 30 - 5) is . link, its cas register number is 108-30-5. It also can be called 2,5-Dioxotetrahydrofuran ; Dihydro-2,5-diketotetrahydrofuran ; Dihydro-2,5-furandione ; Butanedioic anhydride ; Succinic acid anhydride ; Succinyloxide ; Tetrahydro-2,5-dioxofuran ; and SAA. This product is stable in the air, not moisture. Similar chemical properties and succinic acid can be halogenated, esterification, oxidation, reduction, and ammonia reactions. Low toxicity, irritation of the eyes.