You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-(4-chlorophenyl)-N-[(1S)-1-(2-methyl-1,3-thiazol-4-yl)ethyl]imidazo[2,1-b][1,3]thiazole-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H15ClN4OS2
assistant