You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-3-[[2-(4-methylphenyl)-1,3-oxazol-4-yl]methyl]-2-[[4-(methylsulfamoyl)phenyl]methyl]guanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H27N5O3S
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