Synonyms: (4R,4aS,12aR)-4-(dimethylamino)-1,10,11,12a-tetrahydroxy-6-methyl-3, 12-dioxo-4a,5-dihydro-4H-tetracene-2-carboxamide;hydrochloride;4-Epianhydrotetracycline hydrochloride 'can be used as secondary standard';4-Epianhydrotetracycline hydrochloride;