Flavanes and homoisoflavanes in Chinese dragon's blood

Objective To study the flavanes and homoisoflavanes from dichloromethane fraction in Chinese dragon's blood.Methods The compounds were isolated by chromatography on silica gel,polyamide column and recrystallization and the chemical structures were identified on the basis of physico-chemical constants and spectral analyses.Results Six compounds were obtained and their structures were identified as 7-hydroxy-4'-methoxy flavane(1),4'-hydroxy-7-methoxy-8-methylflavane(2),5,4'-dihydroxy-7-methoxy-6-methyl flavane(3),7,4'-dihydroxy-homoisoflavane(4),6,4'-dihydroxy-7-methoxyhomoisoflavane(5),and 10-hydroxy-11-methoxydracaenone(6).Conclusions Compound 6 is isolated from the plant for the first time and compound 2 is isolated from Chinese dragon's blood for the first time.