308 Purpurin
中药学

        [异名]紫茜素红紫素[结构式][主要物性]分子式C14H8O5;分子量256.20。红色针晶(CHCl3-CH3OH),熔点257～259℃。UVλmaxCH3OHnm:202.0,266.8,311.2。IRνmaxKBrcm-1:3375,1620,1585,1460,1300,1180,1060,960,770,740。1HNMR(DMSO-d6)δ:13.42,13.20(each1H,s,α-OH),11.51(1H,br,s,β-OH),7.8    （共 355 字）     [阅读本文] >>