» Norethindrone and Mestranol Tablets contain not less than 90.0 percent and not more than 110.0 percent of the labeled amount of norethindrone (C₂₀H₂₆O₂), and not less than 90.0 percent and not more than 110.0 percent of the labeled amount of mestranol (C₂₁H₂₆O₂).