You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-ethyl-N'-[[1-(2-methoxyethyl)cyclobutyl]methyl]-1,3,3a,4,5,6,7,7a-octahydroisoindole-2-carboximidamide;hydroiodide by IUPAC nomenclature, provide its molecular formula.
user
C19H36IN3O
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