You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-acetyl-2-(3,4-dimethoxyphenyl)-N-(3-methoxypropyl)-1,3-thiazolidine-4-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C18H26N2O5S
assistant