Roxithromycin Impurities

Dear Sir,

We have available below Impurities of Roxithromycin.

1.Roxithromycin 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-methyloxan-2-yl]oxy-14-ethyl-7,12,13-trihydroxy-4-[(2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl]oxy-3,5,7,9,11,13-hexamethyl-1-oxacyclotetradecane-2,10-dione
CAS Number: 59319-72-1
Molecular Formula: C37H67NO13
Molecular Weight: 733.93

2.Roxithromycin EP Impurity B
Synonyms: Decladinose Roxithromycin
Chemical Name: (9E)-3-O-de(2,6-dideoxy-3-C-methyl-3-O-methyl-I -L-ribo-hexopyranosyl)erythromycin9-[O-[(2-Methoxyet
CAS Number: 214902-82-6
Molecular Formula: C33H62N2O12
Molecular Weight: 678.85

3.Roxithromycin EP Impurity C
Synonyms: Erythromycin A Oxime
Chemical Name: 9-Erythromycin 9-Oxime; 9-Erythromycin A Oxime; Erythromycin Oxime
CAS Number: 13127-18-9
Molecular Formula: C37H68N2O13
Molecular Weight: 748.94

4. Roxithromycin EP Impurity D
2'-O-[(2-Methoxyethoxy)methyl] Roxithromycin; (3R,4S,5S,6R,9R,11S,12R,13S,14R,E)-6-(((2S,3R,4S,6R)-4-(dimethylamino)-3-((2-methoxyethoxy)methoxy)-6-methyltetrahydro-2H-pyran-2-yl)oxy)-14-ethyl-7,12,13-trihydroxy-4-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-10-(((2-methoxyethoxy)methoxy)imino)-3,5,7,9,11,13-hexamethyloxacyclotetradecan-2-one.
Molecular Formula: C41H76N2O15
Molecular Weight: 837.04

5.Roxithromycin EP Impurity F
Synonyms: N-Demethyl Roxithromycin
Chemical Name: (9E)-9-[O-[(2-