[Code of Federal Regulations] [Title 21 Volume 5] [Revised as of April 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR333.320] [Page 223] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PART 333--TOPICAL ANTIMICROBIAL DRUG PRODUCTS FOR OVER-THE-COUNTER HUMAN USE--Table of Contents Subpart D--Topical Acne Drug Products Sec. 333.320 Permitted combinations of active ingredients. (a) Resorcinol identified in Sec. 333.310(a) when combined with sulfur identified in Sec. 333.310(e) provided the product is labeled according to Sec. 333.350. (b) Resorcinol monoacetate identified in Sec. 333.310(b) when combined with sulfur identified in Sec. 333.310(e) provided the product is labeled according to Sec. 333.350.