Chemical FillingChina Tylosin 3-Acetate 4b- (3-methylbutanoate) (2r, 3r) -2, 3-Dihydroxybutanedioate CAS No. 63428-13-7, Find details about China Tylosin 3-Acetate 4b- (3-methylbutanoate) , CAS No. 63428-13-7 from Tylosin 3-Acetate 4b- (3-methylbutanoate) (2r, 3r) -2, 3-Dihydroxybutanedioate CAS No. 63428-13-7