1-Naphthalenesulfonic acid, 3-diazo-3,4-dihydro-4-oxo-, ar'-(1-methylethyl)(1,1'-biphenyl)-4-yl ester 52125-43-6 EINECS 257-675-1 ar'-Isopropyl(1,1'-biphenyl)-4-yl 3-diazo-3,4-dihydro-4-oxonaphthalene-1-sulphonate