You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-[[(1R,9S)-1-[(1E)-2,6-dimethylhepta-1,5-dienyl]-6-methylidene-3-oxo-2-oxaspiro[4.5]dec-7-en-9-yl]oxycarbonyl]phenyl]-trimethylazanium The above is the IUPAC name of a molecule. Write its molecular formula.
user
C29H38NO4+
assistant