Final answer:
Sulfanilamide is not associated with the first clinical trial on the effects of chemicals on human health; that work was led by Harvey Wiley and led to the Pure Food and Drug Act of 1906.
Step-by-step explanation:
The item not associated with the first "clinical trial" on the effects of certain chemicals on human health is Sulfanilamide. The first clinical trial is related to Harvey Wiley who led a group known as the "Poison Squad." These trials aimed to investigate the effects of meat preservatives and other additives in foods on human health. This work largely contributed to the creation of the Pure Food and Drug Act of 1906, which established federal standards for food and drug safety, including ingredient listing and sanitation requirements for meatpackers.
Sulfanilamide, on the other hand, was involved in a tragic incident that occurred well after the first clinical trials conducted by Wiley's team. It was in the late 1930s when an untested sulfanilamide medication resulted in over a hundred deaths, leading to the passage of the Federal Food, Drug, and Cosmetic Act of 1938, which increased the FDA's authority to regulate drugs.