You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[2-[[(1R,3aR,3bR,5aS,9aS,9bR,11aR)-9a,11a-dimethyl-7-oxo-1,2,3,3a,3b,4,5,5a,6,9b,10,11-dodecahydroindeno[5,4-f]quinoline-1-carbonyl]amino]propan-2-yloxy]-3,4,5-trihydroxyoxane-2-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H42N2O9
assistant