2350-32-5 82029-34-3 Benzoic acid, p-butoxy-, 2-diethylaminoethyl ester, hydrochloride Butoxycaine Butoxycaine hydrochloride Butoxycaine, hydrochloride STADACAIN Stadacaine p-Butoxybenzoic acid 2-diethylaminoethyl ester hydrochloride