Kalugin, V. E. published the artcileThe synthesis of substituted 5-aminopyrido[3′,2′:4,5]thieno[3,2-c]isoquinolines and their sulfinyl and sulfonyl derivatives, Formula: C8H6ClN, the publication is Russian Chemical Bulletin (2018), 67(5), 902-911, database is CAplus.
5-Aminopyrido[3′,2′:4,5]thieno[3,2-c]isoquinolines were synthesized via alkylation of 3-cyanopyridine-2(1H)-thiones with 2-(chloromethyl)benzonitrile followed by treatment of the products with potassium tert-butoxide. The oxidation of the alkylated products to corresponding sulfoxides or sulfones followed by treatment with potassium tert-butoxide provided the corresponding 11-oxides or 11,11-dioxides.
Russian Chemical Bulletin published new progress about 612-13-5. 612-13-5 belongs to nitriles-buliding-blocks, auxiliary class Organic Pigment, name is 2-(Chloromethyl)benzonitrile, and the molecular formula is C8H6ClN, Formula: C8H6ClN.
Referemce:
https://en.wikipedia.org/wiki/Nitrile,
Nitriles – Chemistry LibreTexts