You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-[(2E)-2-butylidene-4-methoxyimino-3-sulfanylidene-1-oxa-9-azaspiro[5.5]undecan-9-yl]-2-fluoro-2-methylbutan-1-one ?
user
C19H29FN2O3S
assistant