Step 1: Understanding the Question:
We need to pick which of the four NSAIDs listed fits the aryl acetic acid derivative description.
Step 2: Key Concept:
NSAIDs are grouped into families based on their core structure, salicylates, fenamates, and aryl acid derivatives being separate groups, and telling them apart means checking how the acid group connects to the aromatic ring.
Step 3: Detailed Explanation:
Salsalate and Aspirin are both salicylates, where the acidic group sits directly on the benzene ring itself, giving them a different backbone from the aryl acid family.
Mefenamic acid is a fenamate, built on an anthranilic acid skeleton rather than an aryl-acid side chain arrangement.
Ibuprofen has an aromatic ring connected through a short carbon side chain to the acidic group, matching the general aryl-plus-acid-chain layout this class of NSAID is described by among the given choices.
Step 4: Final Answer:
Ibuprofen is the option that fits the aryl acetic acid derivative description here.