input: [FORMULA] N2O3 [COMMON NAME] nitrous anhydride [SYSTEM NAME] 
output: dinitrogen trioxide
options: d i n i t r o g e n m o n o x i d e
options: n i t r o g e n m o n o x i d e
options: d i n i t r o g e n t r i o x i d e
options: n i t r o g e n d i o x i d e
options: d i n i t r o g e n t e t r o x i d e
options: d i n i t r o g e n p e n t o x i d e
options: n i t r o g e n t r i o x i d e