You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(1-methylpyrrole-2-carbonyl)-9-propan-2-yl-6-prop-2-enyl-2,6,9-triazaspiro[4.5]decan-10-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H28N4O2
assistant