You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4aS,8aR)-1-propyl-6-(1H-pyrazole-5-carbonyl)-4,4a,5,7,8,8a-hexahydro-3H-1,6-naphthyridin-2-one by IUPAC nomenclature, provide its molecular formula.
user
C15H22N4O2
assistant