Answer:
dinitrogen trioxide
Step-by-step explanation:
The terminology "di" and "tri" are commonly used in scientific writings to represent two and three, respectively. Both "di" and "tri" are IUPAC numerial multiplier that show how many atoms that attached with each other in a molecule. Since the given compound is made from two nitrogen and three oxygen, N2O3, the best way to name it is dinitrogen trioxide.
In reality, nitrogen trioxide is a blue liquid which releases an unpleasant odor.