Anhydrotetracycline Hydrochloride (25 mg) ((4S ,4aS ,12aS )-4-(Dimethylamino)-3,10,11,12a-tetrahydroxy-6-methyl-1,12-dioxo-1,4,4a,5,12,12a-hexahydrotetracene-2-carboxamide monohydrochloride).