1-Butyl-4-(1-naphthalenyl)-4-piperidinol propionate hydrochloride 1-Butyl-4-naphthyl(1)-4-propionoxypiperidine hydrochloride 4-Piperidinol, 1-butyl-4-(1-naphthalenyl)-, propionate, hydrochloride NU-811 Propionic acid, 1-butyl-4-(1-naphthyl)-4-piperidinyl ester hydrochloride TN6877000