You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S)-2-[(2S)-2-(1-adamantyl)-2-aminoacetyl]-2-azabicyclo[3.1.0]hexane-3-carbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H25N3O
assistant