Viomycin methyloxytetracycline nicotinate Viomycin, ((4-(dimethylamino)-1,11-dioxo-3,5,6,10,12,12a-hexahydroxy-6-methyl-1,4,4a,5,5a,6,11,12a-octahydro-2-naphthacenyl)formamido)-, nicotinate (1:3) ZA3923000