methacycline HCl
2-Naphthacenecarboxamide, 4-(Dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,5,10,12,12a-pentahydroxy-6-methylene-1,11-dioxo-, Monohydrochloride,(4S-(4alpha,4aalpha,5alpha,5aalpha,12aalpha))-