You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[(6E)-5,6-diamino-1-[(4-ethoxyphenyl)methylamino]-6-nitroimino-1-oxohexan-2-yl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H32N6O6
assistant