(E)-4-Methyl-N'-(1-(naphthalen-2-yl)-2-oxo-2-(piperidin-1-yl)ethylidene)benzenesulfonohydrazide is an intermediate for the synthesis of (±)-threo-Ethylnaphthidate Hydrochloride (T433447), which is the threo-form of Ethylnaphthidate (Hydrochloride) (CAS: 2170529-69-6) which is a neuroenhancing phenidate analog.