An unusual pentacyclic tetramic acid produced by streptomyces phaeochromogenes; potent activity against the protozoan, trichomonas vaginalis; demonstrates selective gram positive antibacterial activity, and anti-ulcer activity possibly via inhibition of H. Pylori; inhibits the uptake of oxidized low-density lipoprotein in mouse macrophages, blocks PMA and nef-mediated cell surface CD4 down-regulation, and inhibits clathrin-coated pit-mediated endocytosis; a useful agent for studying the process of endocytosis.