You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[[5-chloro-2-(difluoromethoxy)phenyl]methyl]-1-ethyl-3-[3-(2-oxopyrrolidin-1-yl)pentyl]guanidine into molecular formula.
user
C20H29ClF2N4O2
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