You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-[6-[[4-(2,4-dimethyl-1,3-thiazol-5-yl)-1,3-thiazol-2-yl]methyl]pyridin-3-yl]-2-pyridin-4-ylethanone ?
user
C21H18N4OS2
assistant