You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(6S,7R,8aR)-7-[4-(3-hydroxyazetidin-1-yl)piperidine-1-carbonyl]-6-phenyl-2,3,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H30N4O3
assistant