Pyrroles are components of larger aromatic rings, including the porphyrins of heme, the chlorins and bacteriochlorins[?] of chlorophyll, and the corrin ring of vitamin B12.
... Politicheskoye Upravleniye[?] (OGPU, 1923-1934) Narodnyi Kommissariat Gosudarstvennoi Bezopastnosti[?] (NKVD, 1934-1943) Ministerstvo Gosudarstvennoi ...