Sulfanilic acid is a type of organic compound that is commonly used in scientific research. It is also known by several other names, including p-amino-benzenesulfonic acid, 4-aminobenzenesulfonic acid, and aniline-4-sulfonic acid. Sulfanilic acid is an important precursor for the synthesis of a number of dyes, as well as for the production of pharmaceuticals and other chemicals. Due to its versatility, it is also sometimes referred to as a "multifunctional compound". Regardless of the name used, sulfanilic acid remains an essential component within many lab settings and can be relied upon to help drive research goals forward.