Doxycycline EP impurity B

Chemical Name: metacycline ; (4S,4aR,5S,5aR,12aS)-4-(Dimethylamino)-3,5,10,12,12a-pentahydroxy-6-methylene-1,11-dioxo-1,4,4a,5,5a,6,11,12a-octahydrotetracene-2-carboxamide hydrochloride

Smile: OC1=C2C(C([C@]3([H])C(C2=O)=C(O)[C@@]4(O)[C@@]([C@H](N(C)C)C(O)=C(C(N)=O)C4=O)([H])[C@H]3O)=C)=CC=C1.Cl