You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(cyclopropylmethyl)-3-methoxy-N-[2-[(5-methyl-1,3-thiazol-2-yl)amino]-2-oxoethyl]benzamide by IUPAC nomenclature, provide its molecular formula.
user
C18H21N3O3S
assistant