You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 3-ethyl-2-[2-(4-fluorophenyl)-2-methoxyethyl]-1-methyl-1-(2-thiophen-2-ylethyl)guanidine;hydroiodide into molecular formula.
user
C19H27FIN3OS
assistant