» Probenecid and Colchicine Tablets contain not less than 90.0 percent and not more than 115.0 percent of the labeled amount of colchicine (C₂₂H₂₅NO₆) and not less than 90.0 percent and not more than 110.0 percent of the labeled amount of probenecid (C₁₃H₁₉NO₄S).