1-(3-Sulfopropyl)pyridinium hydroxide, inner salt 1-(3-Sulphonatopropyl)pyridinium 15471-17-7 EINECS 239-491-3 N-3-Sulfopropylpyridinium betaine Pyridinium, 1-(3-sulfopropyl)-, hydroxide, inner salt Pyridinium, 1-(3-sulfopropyl)-, inner salt