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1,2,3-benzotriazole appears as white to light tan crystals or white powder. No odor. (NTP, 1992) Benzotriazole is the simplest member of the class of benzotriazoles that consists of a benzene nucleus fused to a 1H-1,2,3-triazole ring. It has a role as an environmental contaminant and a xenobiotic.

4-azabenzimidazole is the [4,5-b]-fused isomer of imidazopyridine.

Imidazo[1,2-a]pyrazine is an imidazopyrazine, a polycyclic heteroarene and an azaarene.

The [4,5-b]-fused isomer of imidazopyridine." []

The simplest member of the class of benzotriazoles that consists of a benzene nucleus fused to a 1H-1,2,3-triazole ring." []

Pyrrolopyrimidine nucleosides analogs, collectively referred to as deazapurines, are an important class of structurally diverse compounds found in a wide variety of biological niches |CITS: [18721750]|.