The molecule is an ammonium ion that is the conjugate acid of tigecycline; major species at pH 7.3. It is a conjugate acid of a tigecycline.
(4S,4aS,5aR,12aR)-9-[[2-(tert-butylazaniumyl)acetyl]amino]-2-carbamoyl-7-(dimethylamino)-4-(dimethylazaniumyl)-10,11,12a-trihydroxy-3,12-dioxo-4a,5,5a,6-tetrahydro-4H-tetracen-1-olate