The active ingredient of the product consists of any of the following:
Benzoyl peroxide, 2.5 to 10 percent.
Resorcinol, 2 percent, when combined with sulfur in accordance with § 333.320(a).
Resorcinol monoacetate, 3 percent, when combined with sulfur in accordance with § 333.320(b).
Salicylic acid, 0.5 to 2 percent.
Sulfur, 3 to 10 percent.
Sulfur, 3 to 8 percent, when combined with resorcinol or resorcinol monoacetate in accordance with § 333.320.