You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 1-[(4,5-dimethyl-1,3-oxazol-2-yl)methyl]-3-ethyl-2-[[3-(methylsulfamoylmethyl)phenyl]methyl]guanidine using the IUPAC nomenclature.
user
C18H27N5O3S
assistant