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 (7S,8aS)-7-(3-imidazo[1,5-a]pyridin-5-ylpropyl)-2-(5-methylpyridin-2-yl)-1,3,4,7,8,8a-hexahydropyrrolo[1,2-a]pyrazin-6-one .
user
C23H27N5O
assistant