. "Methacycline"@en . . . . "Methacycline"@en . "Metacycline"@en . . "C0025603" . "2-Naphthacenecarboxamide, 4-(dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,5,10,12,12a-pentahydroxy-6-methylene-1,11-dioxo-, (4S-(4alpha,4aalpha,5alpha,5aalpha,12aalpha))-"@en . "Methyleneoxytetracycline"@en . . "D008690" .