[(3aR,6Z,9S,9aR,10R,11aS)-5-hydroxy-9-(methoxymethyl)-9a,11a-dimethyl-1,4,7-trioxo-6-(pyrrolidin-1-ylmethylidene)-2,3,3a,9,10,11-hexahydroindeno[4,5-h]isochromen-10-yl] acetate