You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-hydroxy-4-methyl-N-[[(2S)-oxolan-2-yl]methyl]-N-(thiophen-3-ylmethyl)benzamide is given. What is its corresponding molecular formula?
user
C18H21NO3S
assistant