Midecamycin Impurity 24

(4R,5S,6S,7R,9R,10R,11E,13E,16R) -10-acetoxy-6- (((2S,3S,4R,5S,6S) -5- (((2R,4R,5S,6S) -4-acetoxy-4,6-dimethyl-5- (propionyloxy) tetrahydro-2H-pyran-2-yl) oxy) -4- (dimethylamino) -3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl) oxy) -5-methoxy-9,16-dimethyl-2-oxo-7- (2-oxoethyl) oxacyclohexadeca-11,13-dien-4-yl butyrate