You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-2-[(3-methyl-1,2,4-oxadiazol-5-yl)methyl]-3-[3-(2-methylpiperidin-1-yl)propyl]guanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H30N6O
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