You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by ethyl 2-[4-(2-formamido-4-methyl-1,3-thiazol-5-yl)pyridin-2-yl]-2-methylpropanoate;1-methylimidazole ?
user
C20H25N5O3S
assistant