Abstract
The marine alkaloids halichlorine, pinnaic acid and tauropinnaic acid, isolated by Uemura and co-workers in 1996, show the common 1-aza-[4.5.0]-spirobicyclic core. The biological activity of halichlorine is related to inhibit vascular cell adhesion molecule-1 (VCAM-1) at IC50 7 mg/mL. The pinnaic acid and tauropinnaic acid are phospholipase A2 (PLA2) inhibitors. Despite the structural sim…