(2R,3S,5R)-5-(6,13-diacetyl-7-oxo-5,6,7,13-tetrahydro-12H-indolo[2,3-a]pyrrolo[3,4-c]carbazol-12-yl)-2-(((4-methylbenzoyl)oxy)methyl)tetrahydrofuran-3-yl 4-methylbenzoate