Synonyms: 1-(2-Hydroxyethyl)-1-(2-hydroxy-3-sulfopropyl)-2-undecyl-2-imidazoliniumhydroxide, sodium salt (7CI); 1H-Imidazolium,4,5-dihydro-1-(2-hydroxyethyl)-1-(2-hydroxy-3-sulfopropyl)-2-undecyl-,hydroxide, monosodium salt (9CI); 2-Imidazolinium,1-(2-hydroxyethyl)-1-(2-hydroxy-3-sulfopropyl)-2-undecyl-, hydroxide,monosodium salt (8CI)