You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(3,5-dimethylphenyl)-3-methyl-N-[(2-methyl-1,3-thiazol-5-yl)methyl]-N-pyridin-2-ylbut-2-enamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H25N3OS
assistant