15958-19-7 3-Chloro-6-((2-hydroxy-1-naphthalenyl)azo)-4-methylbenzenesulfonic acid, strontium salt (2:1) 73263-40-8 Benzenesulfonic acid, 5-chloro-2-((2-hydroxy-1-naphthalenyl)azo)-4-methyl-, strontium salt (2:1) EINECS 277-335-6 Strontium bis(2-chloro-5-((2-hydroxy-1-naphthyl)azo)toluene-4-sulphonate)