Aspirin for headache

Allergies History of urticaria after taking aspirin for headaches... 

A wide array of derivatizing reagents has been developed, and this list keeps growing with each passing year. However, not all the reagents will be discussed here. Only those that have found more widespread acceptance will be detailed. Many of the more popular derivatizing chemistries are also available as commercial kits. This is more expensive (for materials), but also much more convenient. Additionally, any extra cost in materials will likely be offset by cost savings in method development (and in aspirin for headaches). 

A 17-year-old patient complains that he gets severe shortness of breath whenever he takes aspirin for headache. Increased levels of which of the following may be responsible, in part, for some cases of aspirin hypersensitivity ... 

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