4-(Hexyloxy)benzilic acid 2-(diethylamino)ethyl ester hydrochloride 6192-64-9 Benzilate Benzilic acid, 4-(hexyloxy)-, 2-(diethylamino)ethyl ester, hydrochloride Topicaine hydrochloride beta-Diethylaminoethyl p-n-hexyloxybenzilate hydrochloride