126646-16-0 3,6,9,12-Tetraoxaoctadecanoic acid, sodium salt PEG-4 Hexyl ether carboxylic acid, sodium salt Polyethylene glycol 200 hexyl ether carboxylic acid, sodium salt Polyoxyethylene (4) hexyl ether carboxylic acid, sodium salt Sodium 3,6,9,12-tetraoxaoctadecanoate Sodium hexeth-4 carboxylate Sodium polyethylene glycol 200 hexyl ether carboxylate Sodium polyoxyethylene (4) hexyl ether carboxylate