Doxycycline EP impurity D

Chemical Name: 4-epi-6-epidoxycycline ; (4R,4aR,5S,5aR,6S,12aS)-4-(Dimethylamino)-3,5,10,12,12a-pentahydroxy-6-methyl-1,11-dioxo-1,4,4a,5,5a,6,11,12a-octahydrotetracene-2-carboxamide

Smile: O=C(C1=C(O)[C@H](N(C)C)[C@@]([C@@H](O)[C@@]2([H])C(C(C3=C(O)C=CC=C3[C@H]2C)=O)=C4O)([H])[C@@]4(O)C1=O)N