You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(6-ethyl-1,3-benzothiazol-2-yl)-3-methyl-N-(pyridin-2-ylmethyl)-1,2-oxazole-5-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H18N4O2S
assistant