Bojarska-Dahlig, Halina published the artcileFeasibility of synthesizing 3,5-diiodo-4-pyridoxyacetic acid, the isomer of 3,5-diiodo-4-pyridone-N-acetic acid, Quality Control of 101-29-1, the publication is Acta Poloniae Pharmaceutica (1957), 457-8, database is CAplus.
The Ag salt of 3,5-diiodo-4-hydroxypyridine and ClCH2CO2Et in xylene or C5H5N give Et 3,5-diiodo-4-pyridone-N-acetate (I), m. 178-9°. The O-substituted isomer is not formed. The identity of I was established by determination of the mixed m.p. of I and of the free acid from I (m. 241-2°) with pure compounds prepared by a different method.
Acta Poloniae Pharmaceutica published new progress about 101-29-1. 101-29-1 belongs to iodides-buliding-blocks, auxiliary class Pyridine,Iodide,Carboxylic acid,Ketone, name is 2-(3,5-Diiodo-4-oxopyridin-1(4H)-yl)acetic acid, and the molecular formula is C7H5I2NO3, Quality Control of 101-29-1.
Referemce:
https://en.wikipedia.org/wiki/Iodide,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com