You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1-[2-(4-fluoro-2-methylphenyl)ethyl]-2-methyl-3-(thiophen-3-ylmethyl)guanidine is given. What is its corresponding molecular formula?
user
C16H20FN3S
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