You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 2-methyl-1-methylsulfonyl-N-[(3,4,5-trimethoxyphenyl)methyl]-2,3-dihydroindole-5-carboxamide ?
user
C21H26N2O6S
assistant