You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[3-(3-ethylphenoxy)azetidin-1-yl]-[(5S)-5-methyl-4,5,6,7-tetrahydro-1H-indazol-3-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H25N3O2
assistant