You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-(4-ethoxyphenyl)-N-[(5-methylimidazo[1,2-a]pyridin-2-yl)methyl]-1,3-thiazole-4-carboxamide .
user
C21H20N4O2S
assistant