D. Moisten 1 g of the sample, in powder, with 0.5 ml of strong ammonia solution, add 5 ml of chloroform, occasionally shaking for 10 minutes, add filter. Evaporate the filtrate until dryness and dissolve the residue in1 ml of ethanol, and add a few drops of modified Dragendorff TS 2: an orange precipitate is produced.