Fischer, Eberhard published the artcilePreparation and reactions of pyridinium betaines, HPLC of Formula: 17281-59-3, the publication is Zeitschrift fuer Chemie (1978), 18(4), 137-8, database is CAplus.
Reaction of the pyridinium compounds I (R = H, Me) with R1NCS (R1 = Et, Ph, 4-ClC6H4) gave the betaines II, which reacted with R2COCl (R2 = Ph, 2-, 3-O2NC6H4, 3,4-Cl2C6H3, CH2Cl, OMe, COCl) to give the pyridinum chlorides III.
Zeitschrift fuer Chemie published new progress about 17281-59-3. 17281-59-3 belongs to pyridine-derivatives, auxiliary class Pyridine,Nitrile,Salt, name is 1-(Cyanomethyl)pyridin-1-ium chloride, and the molecular formula is C7H7ClN2, HPLC of Formula: 17281-59-3.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem