So does nearly every protein. Phenylalanine, tryptophan, and tyrosine all have benzene rings, and nearly every protein contains at least one of those amino acids. Aspirin, acetaminophen, ibuprofen. Vitamin E, vitamin B12. Melatonin. Adrenaline. Capsaicin. Vanillin. All contain benzene rings. It's like @Kentucky said. You can't infer the properties of a substance by looking at just one part of its structure.