You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-amino-3-ethoxy-2,2-dimethyl-N-[[2-(3-methylbutoxy)phenyl]methyl]cyclobutane-1-carboxamide;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H35ClN2O3
assistant