1-(Dimethylamino)-2-((dimethylamino)methyl)-2-butanol benzoate hydrochloride dihydrate 2-Butanol, 1-(dimethylamino)-2-((dimethylamino)methyl)-, benzoate, hydrochloride, hydrate (1:1:2) Amydricaine hydrochloride dihydrate EL2381000