Product name: Oxytetracycline H. S: 29413020 A yellow crystalline powder pH 4.5-7.5 Specific optical rotation -203 to -216 Absortance 290-310 Identification POSITIVE Specific optical rotation [a] 20D -203~-216 -203~-216 Acidity or alkalinity 4.5~7.5 4.5~7.0 4.5~7.5 Loss on drying (%) 4.0~8.0 6.0~9.0 4.0~8.