Question: Carnosine, a dipeptide molecule, featuring the characteristic ring of an inorganic compound with what formula? 

Context paragraphs:
Borazine: Borazine is an inorganic compound with the chemical formula (BH)(NH).  In this cyclic compound, the three BH units and three NH units alternate.  The compound is isoelectronic and isostructural with benzene.  Like benzene, borazine is a colourless liquid.  For this reason borazine is sometimes referred to as "inorganic benzene".

Imidazole: Imidazole is an organic compound with the formula CNH.  It is a white or colourless solid that is soluble in water, producing a mildly alkaline solution.  In chemistry, it is an aromatic heterocycle, classified as a diazole, and having non-adjacent nitrogen atoms.

Pentazole: Pentazole is an aromatic chemical molecule consisting of a five-membered ring with all nitrogen atoms, one of which is bonded to a hydrogen atom.  It has a molecular formula HN.  Its SMILES structure is N1N[NH]NN1 .  Although strictly speaking a homocyclic, inorganic compound, pentazole has historically been classed as the last in a series of heterocyclic azole compounds containing one to five nitrogen atoms.  This set contains pyrrole, imidazole, pyrazole, triazoles, tetrazoles, and pentazole.

Hexachlorophosphazene: Hexachlorophosphazene is an inorganic compound with the formula (NPCl).  The molecule has a cyclic backbone consisting of alternating phosphorus and nitrogen atoms.  It can be viewed as a trimer of the hypothetical compound N≡PCl.  Hexachlorophosphazene together with the related (NPCl) are precursors to inorganic polymers called polyphosphazenes.

Wolffram's red salt: Wolffram’s Red Salt is an inorganic compound with the double salt formula [Pt(CHNH)Cl][Pt(CHNH)]Cl·4HO.  This compound is an early example of a one-dimensional coordination polymer, serving as a representative structure for studies in solid-state physics.  This species has been of interest due to the unusual mixed valence system of Pt(II) and Pt(IV) bridged by a chlorine atom.  The deep red color of the double salt, where the components were colorless, piqued the interest of early inorganic chemists and ultimately inspired studies into the physical properties of the compound in search of potential applications.

IUPAC nomenclature of inorganic chemistry: In chemical nomenclature, the IUPAC nomenclature of inorganic chemistry is a systematic method of naming inorganic chemical compounds, as recommended by the International Union of Pure and Applied Chemistry (IUPAC).  It is published in "Nomenclature of Inorganic Chemistry" (which is informally called the Red Book).  Ideally, every inorganic compound should have a name from which an unambiguous formula can be determined.  There is also an IUPAC nomenclature of organic chemistry.

Fluorosulfuric acid: Fluorosulfuric acid (IUPAC name: sulfurofluoridic acid) is the inorganic compound with the chemical formula HSOF.  It is one of the strongest acids commercially available.  The formula HSOF emphasizes its relationship to sulfuric acid, HSO; HSOF is a tetrahedral molecule.  It is a colourless liquid, although commercial samples are often yellow.

Carnosine: Carnosine ("beta"-alanyl--histidine), featuring the characteristic Imidazole-ring, is a dipeptide molecule, made up of the amino acids beta-alanine and histidine.  It is highly concentrated in muscle and brain tissues.

Acetylcarnosine: "N"-Acetylcarnosine (NAC) is a naturally occurring compound chemically related to the dipeptide carnosine.  The NAC molecular structure is identical to carnosine with the exception that it carries an additional acetyl group.  The acetylation makes NAC more resistant to degradation by carnosinase, an enzyme that breaks down carnosine to its constituent amino acids, beta-alanine and histidine.

Arsenic tribromide: Arsenic tribromide is the inorganic compound with the formula AsBr.  This pyramidal molecule is the only known binary arsenic bromide.  AsBr is noteworthy for its very high refractive index of approximately 2.3.  It also has a very high diamagnetic susceptibility.  The compound exists as colourless deliquescent crystals that fume in moist air.

Supporting paragraphs: Carnosine Imidazole
Answer: CNH