You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-[(5-chlorothiophen-2-yl)sulfonylamino]ethyl]-1-(3-propan-2-ylphenyl)guanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H21ClN4O2S2
assistant