16，CAS#:18728-61-52-(1-羟***)***ChemicalName:1-Pyridin-2-yl-ethanol17，CAS#:2434-56-24,6-二氨基***4,6-Diaminopyrimidine18，CAS#:1034-49-7***甲基三******化磷ChemicalName:(Bromomethyl)triphenylphosphoniumbromide19，CAS#:33342-65-32-氯-5-甲基***唑ChemicalName:2-Chloro-5-methylthiazole20，CAS#:6192-01-43-乙氧基***ChemicalName:3-Ethoxyacrylicacid)