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Clarithromycin EP Imp H ClarithroMycin IMpurity H ClarithroMycin EP IMpurity H Clarithromycin related compound H N-DeMethyl-N-forMyl ClarithroMycin 3"-N-DeMethyl-3"-N-forMylclarithroMycin Clarithromycin EP Impurity H (USP RC H) N-DeMethyl-N-forMyl-6-O-MethylerythroMycin Erythromycin, N-demethyl-N-formyl-6-O-methyl- 3″-N-Demethyl-3′-N-formyl-6-O-methylerythromycin A Clarithromycin Impurity 8(Clarithromycin EP Impurity H) N-((2S,3R,4S,6R)-2-(((3R,4S,5S,6R,7R,9R,11R,12R,13S,14R)- Clarithromycin Impurity H (10 mg) (N-formyl clarithromycin) Clarithromycin EP Impurity H/N-Demethyl-N-formyl Clarithromycin