You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(4-chlorophenyl)-4-[[N-ethyl-N'-[2-(furan-2-yl)-2-hydroxypropyl]carbamimidoyl]amino]butanamide by IUPAC nomenclature, provide its molecular formula.
user
C20H27ClN4O3
assistant