An antiprion agent; inhibits prion formation in yeast- and mammalian-based screening assays; inhibits protein folding activity of the ribosome at 300 μM; directly competes with protein substrates for the ribosome active site and decreases the yield of refolded protein without affecting the rate of refolding; prevents progressive wing position defects in a Drosophila model of OPMD at 300-400 μM in larvae and 1-3 mM in adults