Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) called Synthesis of imidazo[4,5-b]pyrazine nucleosides, Author is Panzica, Raymond P.; Townsend, Leroy B., which mentions a compound: 4531-54-8, SMILESS is NC1=C([N+]([O-])=O)N=CN1C, Molecular C4H6N4O2, Recommanded Product: 1-Methyl-4-nitro-1H-imidazol-5-amine.
5,6-Dimethyl-1-(β-D-ribofuranosyl)imidazo[4,5-b]pyrazine (I; R = β-D-ribofuranosyl) was prepared by glycosylation of the Me3Si derivative (I; R = Me3Si) (II), by fusion with 1-O-acetyl-2,3,5-tri-O-benzoyl-β-D-ribofuranose, or by cycloaddition of 4,5-diamino-1-(β-D-ribofuranosyl)-imidazole with biacetyl.
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Reference:
Thiomorpholine – Wikipedia,
Thiomorpholine | C4H9NS – PubChem