You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-[cyclohexyl(methyl)amino]ethyl]-N,2-dimethylpyrazolo[1,5-a]pyrimidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H27N5O
assistant