15687-27-1 31121-93-4 Benzeneacetic acid, alpha-methyl-4-(2-methylpropyl)-, sodium salt (9CI) EINECS 250-477-6 Hydratropic acid, p-isobutyl-, sodium salt Ibuprofen sodium Sodium 2-(4-isobutylphenyl)propionate Sodium ibuprofen p-Isobutylhydratropic acid sodium salt