1-NAPHTHALENESULFONIC ACID, 4-(3-(p-BUTOXYPHENYL)-2-THIOUREIDO)-, SODIUM SALT 33326-68-0 4-(3-(p-Butoxyphenyl)-2-thioureido)-1-naphthalenesulfonic acid sodium salt N-(1-Sulfo-4-naphthyl)-N'-p-butoxyphenylthiourea sodium salt