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-[[3-(2-hydroxyethyl)oxolan-3-yl]methyl]-2-methyl-3-[(2-pyrazol-1-ylphenyl)methyl]guanidine into molecular formula.
user
C19H27N5O2
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