You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[1-[[2-hydroxyethyl(methyl)amino]methyl]cyclopentyl]methyl]-4,5,6,7,8,9-hexahydrocycloocta[b]thiophene-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H34N2O2S
assistant