You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-[3-(2-ethoxyphenyl)-4-oxo-1,3-thiazolidin-2-yl]phenyl]cyclopropanecarboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22N2O3S
assistant