A white or off-white powder, Freely soluble (1500 mg/L or greater) in organic solvents (hexane,acetone, acetonitrile, chloroform, dichloromethane, ethyl acetate, methanol, tetrahydrofuran); water solubility is temperature and pH dependent, but is 566 mg/mL at pH 7 and 25癈. Purity: Tilmicosin consists of 82-88% cis isomer and 12-18% trans isomer, as determined by liquid chromatographic assay.(85%MIN)