You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[3-(2,5-dihydropyrrol-1-yl)phenyl]methyl]-3-(2-ethyl-5,6,7,8-tetrahydro-[1,2,4]triazolo[1,5-a]pyridin-6-yl)-2-methylguanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H30IN7
assistant