You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3-ethyl-1-methyl-2-[[6-(2-methylimidazol-1-yl)pyridin-3-yl]methyl]-1-(2-thiophen-2-ylethyl)guanidine;hydroiodide .
user
C20H27IN6S
assistant