You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 5-[amino(4-oxobutan-2-yl)amino]-3-[[6-(azetidine-1-carbonyl)pyridin-3-yl]amino]pyrazine-2-carboxamide .
user
C18H22N8O3
assistant