A resin acid; reduces mRNA expression, protein levels, and promoter activity of MMP-9 in TNF-α-stimulated HASMCs from 5-20 μM; reduces nuclear expression and binding of NF-κB and AP-1 to the MMP-9 promoter in HASMCs from 10-20 μM; reduces TNF-α-induced HASMC migration to control levels at 20 μg/ml