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 3-[(1R)-1-cyclopropyl-2-phenylethyl]-1-methyl-1-[(1R)-1-pyridin-4-ylethyl]urea using the IUPAC nomenclature.
user
C20H25N3O
assistant