Definition: Acetamide, also known as 4-aminobenzoic acid or 4-nitrobenzaldehyde (NAD), is a compound that is found in many plants and is used to make amylase, an enzyme used by bacteria to break down starch into sugars. It is the active ingredient in several different medications, including Amoxicillin, Doxycycline, Fluconazole, Prostaglandins, and Nitrofurantoin.