You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-(2,3-dihydro-1H-inden-2-yl)acetyl]-N-(2-methylpropyl)pyrazolidine-1-carbothioamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H27N3OS
assistant