You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (6Z,9E,11Z,12Z)-11-ethylidene-12-[(2E)-2-(hydroxymethylidene)octylidene]-8-oxo-5-azaspiro[3.9]trideca-6,9-diene-9-carboxylic acid into its molecular formula.
user
C24H33NO4
assistant