1. In allergy sufferers, histamine causes runny noses, red eyes, and other symptoms. Here is its structural formula. a. Give the chemical formula for this compound. Ans: C5H9N3 b. Circle the amine functional groups in histamine. Ans:  c. Which part (or parts) of the molecule make the compound water-soluble? Ans:    2. Antihistamines are widely used drugs for treating symptoms of allergies caused by reactions to histamine compounds. This class of drug competes with histamine, occupying receptor sites on cells […]