You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-butyl-3-ethyl-8,8,10,10-tetramethyl-9-(1-phenylethoxy)-1,5-dioxa-9-azaspiro[5.5]undecane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H43NO3
assistant