You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule ethyl 4-[2-[3-[(1R,9R,10R)-4-hydroxy-17-azatetracyclo[7.5.3.01,10.02,7]heptadeca-2(7),3,5-trien-17-yl]propyl]anilino]-4-oxobutanoate into molecular formula.
user
C31H40N2O4
assistant