You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[5-[(2R)-1-(propylsulfonylamino)propan-2-yl]-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-2-yl]methyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H27N5O3S
assistant