You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methylpropyl N-[(2-hydroxy-1H-indol-3-yl)imino]-N'-(oxolan-2-ylmethyl)carbamimidothioate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H24N4O2S
assistant