You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-oxo-1-(3-oxo-3a,5,6,6a-tetrahydrofuro[3,2-b]pyrrol-4-yl)-3-phenylpropan-2-yl]morpholine-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H25N3O5
assistant