亚洲欧美日成人在线_视频一区二区久草_99热在线这里只精品20_亚洲爆乳精品一区二区_日韩高清av无码

【Name】 : Vitamin D2 
【Structural formula】

【Molecular formula】: C₂₈H₄₄O
【CAS code】: 50-14-6 
【Properties】: Colorless needle crystal or white crystal powder, odorless and tasteless, Contact with air and water is easy to deteriorate.
【Package】: Medicinal composite membrane, Aluminum can and Carton.