You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R,4S,5S,7R,10R,11R,12R,22R,23S,26S,28R)-10-acetyloxy-5,23,28-trihydroxy-4,29,29,30-tetramethyl-22-[(2-methylpropan-2-yl)oxycarbonylamino]-3,14,24-trioxo-8,13,25-trioxapentacyclo[24.3.1.04,11.07,10.012,28]triaconta-1(30),20-dien-2-yl] acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C40H57NO15
assistant