You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2-methoxyethoxycarbonylamino)-3-[[(3R)-1-(3-piperidin-4-ylpropanoyl)piperidine-3-carbonyl]amino]propanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H36N4O7
assistant