10-(2,6-Dimethyl-phenyl)-5-ethyl-4a-hydroxy-3-methyl-5,10-dihydro-4aH-benzo[g]pteridine-2,4-dione

3-乙基苯甲酸

对甲砜基苯甲醛

对甲苯磺酰氯甲烷

3-乙基甲苯