A form of As2O3 that exists as As4O6 in the solid state. It dissociates to As2O3 upon heating to the vapor phase above 800 degrees Celsius.

An inorganic compound with the chemical formula As2O3 that is used for the treatment of ACUTE PROMYELOCYTIC LEUKEMIA in patients who have relapsed from, or are resistant to, conventional drug therapy.

Synonyms: Trisenox, As4O6, Arsenic Trioxide, Arsenic Oxide (As4O6), Diarsenic Trioxide, Tetra-Arsenic Hexaoxide, Arsenolite, As2O3, Naonobin, 0, Arsenic(III) Oxide, Tetraarsenic Hexaoxide, S7V92P67HO, Tetra Arsenic Hexaoxide, Tetra Arsenic Oxide, Arsenous Anhydride, Tetra-Arsenic Oxide, Tetraarsenic Oxide, Arsenic Oxide (As2O3), Trixenox