(-)-3-(Dimethylamino)-1,2-diphenyl-2-butanol propionate (ester) hydrochloride 2-Butanol, 3-(dimethylamino)-1,2-diphenyl-, propionate (ester), hydrochloride, (-)- EL2540000 l-1,2-Diphenyl-3-dimethylamino-2-propionyloxybutane (ester) hydrochloride