You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
benzyl 3-hydroxyspiro[4.4]nonane-2-carboxylate;benzyl 3-[1-(2-oxo-2-phenylmethoxyethyl)cyclopentyl]propanoate;benzyl 3-oxospiro[4.4]nonane-2-carboxylate;benzyl spiro[4.4]non-2-ene-3-carboxylate;3-[1-(carboxymethyl)cyclopentyl]propanoic acid;methyl (3S)-3-[4-(spiro[4.4]non-2-en-3-ylmethoxy)phenyl]hex-4-ynoate;spiro[4.5]decan-8-one;spiro[4.4]non-2-en-3-ylmethanol is the IUPAC name of a molecule. Please give its molecular formula.
user
C128H166O21
assistant