Cyanuric chloride

An AdvanceIII HD-400 NMR spectrometer (Bruker, Fällanden, Switzerland), Tensor27 IR spectrometer (Bruker), Vario ELIII elemental analyzer (Elementar Analysensysteme GmbH, Langenselbold, Germany), and SGW X-4 micro-melting-point apparatus (Shanghai Shen Guang Instrument Co. Ltd., Shanghai, China) were used in all procedures. Para-hydroxybenzaldehyde (analytical purity), cyanuric chloride (analytical purity), 1,4-dioxane (analytical purity), triethylamine, 10% anhydrous Na₂CO₃ (analytical purity), ethyl acetate (analytical purity), glacial acetic acid (analytical purity), 4-amino-1,2,4-triazole, trichloromethane (analytical purity), ethanol (analytical purity), sodium carboxymethyl cellulose, and silica gel GF254 (analytical purity) were purchased from SinoPharm (Shanghai, China). The human lung adenocarcinoma cell line A549 and human hepatoma cell line Bel7402 were purchased from the cell bank of the Chinese Academy of Sciences (Shanghai, China). RPMI-1640 culture medium, trypsinase, and fetal calf serum were obtained from Gibco (Carlsbad, CA, USA). 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) was purchased from Invitrogen (Carlsbad, CA, USA).

Poly(ethylene-co-vinyl alcohol) (EVOH, model: ET3803, 38 mol% ethylene) was purchased from Nippon Gohsei, Japan. Cellulose acetate butyrate ester (CAB, model: 381-20) was supplied by the Eastman Chemical. 1,4-Dioxane, cyanuric chloride, l-lysine, epichlorohydrin, diethylenetriamine and potassium dichromate (K₂Cr₂O₇), were supplied by Sinopharm Chemical Reagent Co., Ltd.