6-{[6-{[(10Z,12E)-4,14-dihydroxy-5-methoxy-9,16-dimethyl-2-oxo-7-(2-oxoethyl)oxacyclohexadeca-10,12-dien-6-yl]oxy}-4-(dimethylamino)-5-hydroxy-2-methyltetrahydro-2H-pyran-3-yl]oxy}-4-hydroxy-2,4-dimethyltetrahydro-2H-pyran-3-yl butanoate (non-preferred na