[R-(R*,R*)]-α-Ethyl-β-(hydroxymethyl)-1-methyl-1H-imidazole-5-butanoic Acid Monosodium Salt; Isopilocarpinate Sodium Salt; Isopilocarpinic Acid Sodium Salt; (αR,βR)-α-Ethyl-β-(hydroxymethyl)-1-methyl-1H-imidazole-5-butanoic Acid Sodium Salt; 1,2-Seco-3-isopilocarpin-2-oic Acid Sodium Salt