» Compound Undecylenic Acid Ointment contains undecylenic acid, calcium undecylenate, copper undecylenate, or zinc undecylenate, individually or in any combination, in a suitable ointment base. It contains not less than 90.0 percent and not more than 110.0 percent of the labeled amount of total undecylenic acid (C₁₁H₂₀O₂).