32500-19-9 4,4'-(2-Pyridinylmethylene)bisphenol mono(hydrogen sulfate) (ester) monosodium salt 4-(alpha-(p-Hydroxyphenyl)-2-picolyl)phenylsulfuric acid sodium salt Phenol, 4,4'-(2-pyridinylmethylene)bis-, mono(hydrogen sulfate) (ester), monosodium salt