The molecule is a zwitterion obtained by transfer of a proton from the 2-hydroxy group to the adjacent tertiary amino group of oxytetracycline; major species at pH 7.3. It is a zwitterion and an a tetracycline zwittterion. It is a tautomer of an oxytetracycline.
(4S,4aR,5S,5aR,6S,12aR)-2-carbamoyl-4-(dimethylazaniumyl)-5,6,10,11,12a-pentahydroxy-6-methyl-3,12-dioxo-4,4a,5,5a-tetrahydrotetracen-1-olate