You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-[2-(furan-2-yl)ethyl]-2-[(3-propan-2-yl-1,2-oxazol-5-yl)methyl]-3-(2-thiophen-2-ylethyl)guanidine into molecular formula.
user
C20H26N4O2S
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