You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[3-[(4-chlorophenyl)-[4-(2-hydroxyethyl)piperazin-1-yl]methyl]-5-ethylthiophen-2-yl]benzamide into molecular formula.
user
C26H30ClN3O2S
assistant