Clarithromycin Impurity H (10 mg) (3\-N-Demethyl-3\"-N-formyl-6-O-methylerythromycin A),
https://www.manchesterbeacon.org/shop/rw2-1134620-clarithromycin-impurity-h-10-mg-3-n-demethyl-3-n-formyl-6-o-methylerythromycin-a-303362
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This Clarithromycin is guaranteed a Impurity with the use of H A), and directly supplied to your lab by Gentaur's warehouse.
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%20(3--N-Demethyl-3-%22-N-formyl-6-O-methylerythromycin%20A),?unique=4e35d75)