You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[2-(3,5-dimethylphenyl)ethyl]-1-ethyl-3-(2-methyl-5,6,7,8-tetrahydro-[1,2,4]triazolo[1,5-a]pyridin-6-yl)guanidine;hydroiodide by IUPAC nomenclature, provide its molecular formula.
user
C20H31IN6
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