You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(5-ethylthiophen-2-yl)methyl]-2-methyl-3-(2-thiomorpholin-4-ylsulfonylethyl)guanidine;hydroiodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H27IN4O2S3
assistant