You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[3-(difluoromethoxy)-4-methoxyphenyl]methyl]-1-ethyl-3-[(1-ethylpyrrolidin-2-yl)methyl]guanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H30F2N4O2
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