You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named acetaldehyde;(Z,2Z)-2-[1-hydroxy-2-(3-methylcyclohex-2-en-1-yl)ethylidene]-3-methylhex-3-en-5-ynenitrile by IUPAC nomenclature, provide its molecular formula.
user
C18H23NO2
assistant