N2O3\mathrm{N}_{2} \mathrm{O}_{3}N2O3
P2O3\mathrm{P}_{2} \mathrm{O}_{3}P2O3
Cl2O3\mathrm{Cl}_{2} \mathrm{O}_{3}Cl2O3
V2O3\mathrm{V}_{2} \mathrm{O}_{3}V2O3