You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (6S)-2-N-butyl-6-N-cycloheptyl-5,6-dimethyl-4-oxo-7H-pyrazolo[1,5-a]pyrazine-2,6-dicarboxamide .
user
C21H33N5O3
assistant