J Nat Prod. 1988 Sep-Oct; 51(5): 851-6.
Chemical studies on mexican plants used in traditional medicine, VI. Additional new 4-phenylcoumarins from Exostema caribaeum.
Departamento de Farmacia, Facultad de QuÃmica de la Universidad Nacional AutÃ³noma de MÃ©xico, DF.
Six additional 4-phenylcoumarins have been isolated from the MeOH extract of the bark of Exostema caribaeum. Their structures were determined by physical and chemical methods as 4'-5'-dihydroxy-7-methoxy-4-phenyl-5,2'-oxidocoumarin , 5,7,4'-trimethoxy-4-phenylcoumarin , 5,3'-dihydroxy-7,4'-dimethoxy-4-phenylcoumarin , 5-O-beta-D-galactopyranosyl-7,4'-dimethoxy-4-phenylcoumarin , 5-O-beta-D-glucopyranosyl-3',4'-dihydroxy-7-methoxy-4-phenylcoumarin+ ++ , and 5-O-(6"-acetyl)-beta-D-galactopyranosyl-3', 4'-dihydroxy-7-methoxy-4-phenylcoumarin . The last four compounds are new natural products.