Thirteen thiomorpholine-bearing compounds were designed and synthesized as dipeptidyl peptidase Ⅳ (DPP-Ⅳ) inhibitors,w......

为了提高彩色影像的稳定性,延长保存期,在彩色正性材料中,大量地使用了防褪色剂.本文在研究分析现有防褪色剂的类别和化学结构的基......