You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 4-methyl-2-[[4-(1,3-oxazol-5-yl)-6-[(4-sulfamoylphenyl)methylamino]pyrimidin-2-yl]amino]-1,3-thiazole-5-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H21N7O5S2
assistant