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 (6R,7S)-8-[(3-propan-2-ylimidazol-4-yl)methyl]-1-oxa-8-azaspiro[5.5]undecane-7-carbonitrile .
user
C17H26N4O
assistant