You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 3-azaspiro[5.5]undecan-3-yl-[(3R,4S)-4-(1-methylpyrazol-4-yl)pyrrolidin-3-yl]methanone;hydrochloride into molecular formula.
user
C19H31ClN4O
assistant