(1) Take 4g of this product, add 50ml of water to dissolve it, filter it, add ammonia solution to the filtrate to make it alkaline, extract it with chloroform twice, each time with 15ml, combine chloroform solutions, evaporate to dryness, add dilute hydrochloric acid to dissolve the residue, put it in three test tubes, and add 5 drops of potassium bismuth iodide solution to each test tube to generate orange-red precipitate; Add 5 drops of potassium iodide and mercury test solution into a test tube to generate yellow-white precipitate; Add 5 drops of silicotungstic acid test solution to the test tube to generate yellow-white precipitate.

(2) Take 4g of this product, add 15ml ether, plug it, shake and extract for 20min, filter, shake the filtrate to 0.5ml, and use it as the test solution. Another menthol reference substance was added with ether to prepare a solution containing 65438 0 mg per 65438 0 ml as the reference substance solution. According to the thin-layer chromatography test (page 57 of the appendix), absorb 65438 00μ l of the above two solutions, respectively spot them on the same silica gel G thin-layer plate, develop them with n-hexane and ethyl acetate (17:3) as developing agents, take them out, air dry them, and spray them with a mixed solution of 0.5% vanillin, sulfuric acid and ethanol (2:8). In the chromatogram of the test sample, spots with the same color appear in the position corresponding to the chromatogram of the control sample.