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Tigecycline Impurity 4 Tigecycline Impurity 9 Tigecycline USP Impurity F Tigecycline Quinone Impurity Tigecycline Quinone Analogue (S)-4-((6-(2-(tert-butylamino)acetamido) Tigecycline (open C-ring D-ring) Quinone Tigecycline Impurity 2(Tigecycline quinone analog) Tigecycline (open C-ring D-ring) Quinone (Technical Grade) DISCONTINUED. Please see T440035 4-[[(2S)-6-[[2-(tert-butylamino)acetyl]amino]-8-(dimethylamino)-5-hydroxy-4-oxo-2,3-dihydro-1H-naphthalen-2-yl]methyl]-2,5-dihydroxy-3,6-dioxocyclohexa-1,4-diene-1-carboxamide 1,4-Cyclohexadiene-1-carboxamide, 4-[[(2S)-8-(dimethylamino)-6-[[2-[(1,1-dimethylethyl)amino]acetyl]amino]-1,2,3,4-tetrahydro-5-hydroxy-4-oxo-2-naphthalenyl]methyl]-2,5-dihydroxy-3,6-dioxo-