15016-15-6 4-Amino-2-butoxy-benzoic acid 2-(diethylamino)ethyl ester hydrochloride BENZOIC ACID, 4-AMINO-2-BUTOXY-, 2-(DIETHYLAMINO)ETHYL ESTER, HYDROCHLORIDE Benzoic acid, 4-amino-2-butoxy-, 2-(diethylamino)ethyl ester, monohydrochloride Sympocaine hydrochloride