Slack, R. published the artcile3,5-Diiodo-2-pyridone-N-acetic acid, Application of 2-(3,5-Diiodo-4-oxopyridin-1(4H)-yl)acetic acid, the publication is Journal of the Society of Chemical Industry, London (1945), 188, database is CAplus.
3,5-Diiodo-2-pyridone (I) was prepared in 87% yield by the method of Caldwell (C.A. 38, 5806.3), using Cellosolve for recrystallization I reacted with NaOH and ClCH2CO2H to produce 80% of 3,5-diiodo-2-pyridone-1-acetic acid (II), as colorless needles; m. 248-50° (decomposition). II formed salts with diethanolamine and triethanolamine which gave stable 70% aqueous solutions at 15°. A 50% triethanolamine salt solution was toxic to mice at 1.6 mg./g. while a like solution of 3,5-diiodo-4-pyridone-1-acetic acid (Diodone) was toxic at 4.5 mg./g. The latter is used as an x-ray contrast medium.
Journal of the Society of Chemical Industry, London 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 C20H19NO4, Application of 2-(3,5-Diiodo-4-oxopyridin-1(4H)-yl)acetic acid.
Referemce:
https://en.wikipedia.org/wiki/Iodide,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com