1,5-(Butylimino)-1-5-dideoxy-D-glucitol tetrabutanoate 1-Butyl-2R,2.alpha.-[(1-oxybutoxy)methyl]-3.beta.,4.alpha.,5.beta.-piperidinetriyl butanoate 131262-82-3 Glycovir N-Butyl DNJ Prodrug NSC670880 SC-48334 Prodrug SC49483