A mixture of chloroform-methyl alcohol-acetic ether (8:2:1)was used as the developer. The double wavelength reflection sawtooth scanning method was used, the determining wavelength was at 230nm and reference wavelength was at 280 nm.

• 以氯仿-甲醇-乙酸乙酯(8:2:1)为展开剂,双波长反射式锯齿扫描,测定波长230 nm,参比波长280 nm。