Used primarily as an intermediate in the synthesis of nonsteroidal anti-inflammatory drugs (NSAIDs), particularly ibuprofen. It plays a key role in introducing the acyl group during the production of active pharmaceutical ingredients. Its reactivity makes it suitable for forming amide and ester derivatives in organic synthesis. Commonly employed in industrial-scale reactions where efficient acylation is required. Due to its sensitivity to moisture, it is handled under anhydrous conditions in controlled environments.