Clarithromycin EP Impurity A 

Chemical Name: (3R,4S,5S,6R,7R,9R,11R,12R,13S,14R)-6-(((2S,3R,4S,6R)-4-(Dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-14-ethyl-12,13-dihydroxy-4-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-3-(hydroxymethyl)-7-methoxy-5,7,9,11,13-pentamethyloxacyclotetradecane-2,10-dione

Synonym:  Clarithromycin F ; 2-Demethyl-2-(hydroxymethyl)-6-O-methylerythromycin A

Smile: C[C@@H]([C@@H]([C@H](C(O[C@@H]1CC)=O)CO)O[C@@](O[C@@H](C)[C@@H]2O)([H])C[C@@]2(C)OC)[C@H]([C@@](C)(C[C@H](C([C@@H]([C@@H](O)[C@@]1(O)C)C)=O)C)OC)O[C@@](O[C@H](C)C[C@@H]3N(C)C)([H])[C@@H]3O