You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule [(5aS,8aS)-4-pyrimidin-2-yl-3,5,5a,6,8,8a-hexahydro-2H-pyrrolo[3,4-f][1,4]oxazepin-7-yl]-(3-hydroxycyclobutyl)methanone ?
user
C16H22N4O3
assistant