Sato, Nobuhiro published the artcileStudies on pyrazines. 17. An efficient synthesis of pteridine-6-carboxylic acids, Application of 2-Aminomalononitrile 4-methylbenzenesulfonate, the publication is Journal of Heterocyclic Chemistry (1988), 25(6), 1737-40, database is CAplus.
2,4-Diaminopteridine-6-carboxylic acid (I) and pterin-6-carboxylic acid (II) were prepared by permanganate oxidation of the corresponding 6-(2-furyl)-substituted pteridines under mild conditions. Several attempts to cleave the furan ring with other oxidizing agents are also described.
Journal of Heterocyclic Chemistry published new progress about 5098-14-6. 5098-14-6 belongs to nitriles-buliding-blocks, auxiliary class Nitrile,Salt,Sulfonic acid,Amine,Benzene, name is 2-Aminomalononitrile 4-methylbenzenesulfonate, and the molecular formula is C10H11N3O3S, Application of 2-Aminomalononitrile 4-methylbenzenesulfonate.
Referemce:
https://en.wikipedia.org/wiki/Nitrile,
Nitriles – Chemistry LibreTexts