Melent’eva, T. A. published the artcilePolarographic reduction of hydrobromides of dipyrrylmethenes, Related Products of nitriles-buliding-blocks, the publication is Zhurnal Obshchei Khimii (1972), 42(10), 2274-9, database is CAplus.
In I (R = Me, Et, CO2Et, NO2, CN, Ac, CH2CO2H), prepared by heating 2-formyl-3-acetyl-4-methyl-5-carbethoxypyrrole and pyrroles unsubstituted in the 2-position in the presence of HBr, the polarog. curves show a linear relation between halfwave potentials and the substituent constants The transmission of the substituent effect in the β-position with respect to dipyrrolylmethene chromophore occurs mainly through resonance. MeCOCH2CO2Et in AcOH, treated with aqueous NaNO2 and AcOH, followed by Zn dust and Et levulinate, gave 10% 2,4-dimethyl-3-carbethoxymethyl-5-carbethoxypyrrole, which with aqueous alc. NaOH gave the free dicarboxylic acid. The latter was heated with ethanolamine at 150° to give 2,4-dimethyl-3-carboxymethylpyrrole in 50% yield.
Zhurnal Obshchei Khimii published new progress about 26187-28-0. 26187-28-0 belongs to nitriles-buliding-blocks, auxiliary class Pyrrole,Nitrile, name is 2,4-Dimethyl-1H-pyrrole-3-carbonitrile, and the molecular formula is C7H8N2, Related Products of nitriles-buliding-blocks.
Referemce:
https://en.wikipedia.org/wiki/Nitrile,
Nitriles – Chemistry LibreTexts