1-Benzyl-3-carboxylatopyridinium 15534-78-8 15990-43-9 72319-22-3 97387-07-0 EINECS 240-129-1 Pyridinium, 3-carboxy-1-(phenylmethyl)-, hydroxide, inner salt Pyridinium, 3-carboxy-1-(phenylmethyl)-, inner salt