Synonyms: OXYTETRACYCLINE HEMICALCIUM SALT;OXYTETRACYCLINE CALCIUM SALT;oxytetracycline hemicalcium;2-Naphthacenecarboxamide, 4-(dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,5,6,10,12,12a-hexahydroxy-6-methyl-1,11-dioxo-, calcium salt, [4S-(4alpha,4aalpha,5alpha,5aalpha,6beta,12aalpha)]-