Erythromycin Impurity 4

Chemical Name: (2S,3R,4S,6R)-4-(dimethylamino)-2-(((3R,4S,5S,6R,7R,9R,11R,12R,13S,14R)-14-ethyl-7,12,13-trihydroxy-4-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-3,5,7,9,11,13-hexamethyl-2,10-dioxooxacyclotetradecan-6-yl)oxy)-6-methyltetrahydro-2H-pyran-3-yl ethyl fumarate

Smile: O=C(/C=C/C(OCC)=O)O[C@H]([C@H]1N(C)C)[C@](O[C@H](C)C1)([H])O[C@@H]([C@](O)(C[C@H](C([C@@H]([C@@H](O)[C@@]2(O)C)C)=O)C)C)[C@H]([C@@H]([C@H](C(O[C@@H]2CC)=O)C)O[C@@](O[C@@H](C)[C@@H]3O)([H])C[C@@]3(C)OC)C