Galbinic acid
Galbinic acid (α-Acetylsalazinic acid), a lichen acid, shows antibacterial activities against the Gram-positive bacteria B. cereus, B. subtilis, and S. aureus (MICs=62.5, 62.5, 250 μg/ml, respectively). Galbinic acid inhibits the Gram-negative bacterium E. coli (MIC=125 μg/ml)[1][2].