Which compound can be classified as a heteroaryl?

Heteroaryl compounds are characterized by the presence of one or more heteroatoms in an aromatic ring structure. These heteroatoms, which can include nitrogen, oxygen, or sulfur, replace carbon atoms in the ring and contribute to the compound's chemical properties.

Ketorolac, a nonsteroidal anti-inflammatory drug (NSAID), fits the definition of a heteroaryl compound because its structure contains an aromatic ring that includes a nitrogen atom. This structural feature is crucial as it influences the compound's pharmacological activity and how it interacts with biological systems.

Additionally, the other compounds listed do not possess the heteroaromatic structure that characterizes ketorolac. For example, mefenamic acid and sulindac contain carbon-based aromatic rings without heteroatoms in their structures, while meloxicam also does not feature a heteroaryl configuration. Understanding the structural differences and knowing what defines a heteroaryl compound is essential in pharmacology and medicinal chemistry.