1.GMP,ISO9001,ISO4001 2.Delivery: Prompt 3.Sample:Free 4.25kg/Barrel, ... 1.treatment of invalid severe acne 2.treatment of acne cystica 3.acneconglobataCAS 4759-48-2[Purity]99.9% [formula]C20H28O2 ... 1, dry skin, itching, chapped and other mucous membranes. 2, liver and kidney dysfunction, high blood lipids and the ... the chemicals. 3, pregnant and lactating women disabled. Isotretinoin (CAS: 4759-48-2)