You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2S)-N-(4-oxo-2-pyrimidin-4-yl-7,8,9,10-tetrahydro-6H-pyrimido[1,2-a]azepin-10-yl)-2,3-dihydro-1-benzofuran-2-carboxamide into its molecular formula.
user
C22H21N5O3
assistant