You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-methyl-1-[[5-(4-methylphenyl)-1,3-oxazol-2-yl]methyl]-3-[(5-methyl-1,3-thiazol-2-yl)methyl]guanidine;hydroiodide by IUPAC nomenclature, provide its molecular formula.
user
C18H22IN5OS
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