You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[2-(2-chlorophenyl)-2-hydroxyethyl]-1-ethyl-3-[3-(oxan-4-ylmethoxy)propyl]guanidine by IUPAC nomenclature, provide its molecular formula.
user
C20H32ClN3O3
assistant