4,4'-(2-Pyridinylmethylene)bisphenol 1,1'-Bis(hydrogen sulfate) Sodium Salt; 4,4'-(2-Pyridylmethylene)diphenol Bis(hydrogen sulfate) Disodium Salt; DA 1773; Disodium Bis[4-[(hydroxysulfonyl)oxy]phenyl](2-pyridyl)methane; Evacuol; Guttalax;Laxoberon; Neopax; Rapilax