Galbinic Acid (α-acetylsalazinic acid) is a depsidone isolated from the lichen, Usnea undulata. The structure of galbinic acid was elucidated by Elix, Australian National University in 1975. Galbinic Acid is moderately active against Gram-positive bacteria, however its bioactivity has not been extensively investigated.
Asahina Y and Tsukamoto T (1934) Lichen substances. XLII. Constituents of some Usnea species, with special regard to compounds of the salazinic acid group. Berichte der Deutschen Chemischen Gesellschaft [Abteilung] B: Abhandlungen 67B:963
Elix JA and Engkaninan U (1975) Structure of galbinic acid. Depsidone from the lichen Usnea undulata. Aust. J. Chem. 28:1793
Sultana N and Afolayan AJ (2011) A new depsidone and antibacterial activities of compounds from Usnea undulata Stirton. J. Asian Nat. Prod. Res 13:1158