You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-[(2S,4S)-1-(6-ethoxypyrazin-2-yl)-4-methoxypyrrolidin-2-yl]-4-ethyl-1H-1,2,4-triazol-5-one by IUPAC nomenclature, provide its molecular formula.
user
C15H22N6O3
assistant