Bisacodyl Related Compound B (20 mg) (2,4'-(Pyridin-2-ylmethylene)diphenol);2,4'-(2-Pyridinyl-2methylene)diphenol;Bisacodyl Related CoMpound B;2-[(4-hydroxyphenyl)-pyridin-2-ylmethyl]phenol;Bisacodyl EP Impurity B;2-[(4-Hydroxyphenyl)-2-pyridinylmethyl]phenol;2-[(RS)-(4-Hydroxyphenyl)(pyridin-2;Phenol, 2-[(4-hydroxyphenyl)-2-pyridinylmethyl]-