You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-ethyl-2-(1H-indol-2-ylmethyl)-3-[3-(2-oxopyrrolidin-1-yl)propyl]guanidine;hydroiodide into its molecular formula.
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C19H28IN5O
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