The molecule is a zwitterion obtained by transfer of a proton from the 2-hydroxy group to the 1-amino group of minocycline. It is the major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a zwitterion and an a tetracycline zwittterion. It is a conjugate acid of a minocycline(1-). It is a tautomer of a minocycline.
(4S,4aS,5aR,12aR)-2-carbamoyl-7-(dimethylamino)-4-(dimethylazaniumyl)-10,11,12a-trihydroxy-3,12-dioxo-4a,5,5a,6-tetrahydro-4H-tetracen-1-olate