Compounds with elastase inhibition and free radical scavenging activities from Callistemon lanceolatus

Bioassay-guided investigation of the stems of Callistemon lanceolatus led to the isolation of five compounds such as betulinic acid (1), pyracrenic acid (2), arjunolic acid (3), catechin (4), and piceatannol (5). Their structures were elucidated on the basis of spectral studies as well as by comparison with literature data. Elastase inhibition and DPPH radical scavenging activities wereinvestigated for the isolated compounds. Among...