The active ingredient of the product consists of any of the following:

1. (a) Benzoyl peroxide, 2.5 to 10 percent.
2. (b) Resorcinol, 2 percent, when combined with sulfur in accordance with § 333.320(a).
3. (c) Resorcinol monoacetate, 3 percent, when combined with sulfur in accordance with § 333.320(b).
4. (d) Salicylic acid, 0.5 to 2 percent.
5. (e) Sulfur, 3 to 10 percent.
6. (f) Sulfur, 3 to 8 percent, when combined with resorcinol or resorcinol monoacetate in accordance with § 333.320.

[75 FR 9776, Mar. 4, 2010]