The biological activities of these amino sugar derivatives were investigated and it was found that (1) furanodictine B but not furanodictine A, at 20 μM increases neurite formation in vitro in rat pheochromocytoma PC-12 cells, which are a model of neuronal differentiation; (2) furanodictine A and furanodictine B at 0.5–5 μM dose-dependently promote neurite formation in the presence of nerve growth factor (NGF) [25]; and (3) dictyoglucosamine A and dictyoglucosamine B at 1–10 μM dose-dependently induce neurite formation in PC-12 cells [26]. Here, NGF is linked to hereditary pheochromocytoma-paraganglioma.