ChemicalBook--->CAS DataBase List--->13929-35-6

13929-35-6

13929-35-6 Structure

13929-35-6 Structure
IdentificationBack Directory
[Name]

4-O-(Carboxymethyl)rifamycin
[CAS]

13929-35-6
[Synonyms]

C01848
Nacimycin
Nancimycin
NCI-145-604
Rifomycin B
Rifamycin B CRS
Rifamycin impurity A
Rifaximin EP Impurity B
Rifamycin EP Impurity A
Rifaximin impurity B (EP)
4-O-(Carboxymethyl)rifamycin
Rifamycin, 4-O-(carboxymethyl)-
Rifaximin EP Impurity B (Rifamycin B)
Rifaximin Impurity 2 (Rifaximin EP Impurity B)
Rifamycin Impurity 1(Rifamycin EP Impurity A)(Rifamycin B)
[EINECS(EC#)]

237-697-8
[Molecular Formula]

C39H49NO14
[MOL File]

13929-35-6.mol
[Molecular Weight]

755.8
Chemical PropertiesBack Directory
[Melting point ]

300° (dec 160-164°)
[alpha ]

D20 -11° (methanol)
[Boiling point ]

730.16°C (rough estimate)
[density ]

1.2421 (rough estimate)
[refractive index ]

1.5350 (estimate)
[form ]

neat
[pka]

2.69±0.10(Predicted)
[BRN ]

604953
Hazard InformationBack Directory
[Uses]

A Rifamycin (R508200) derivative as antibacterial agent.
[Uses]

Rifamycin B (Rifaximin EP Impurity B) is a Rifamycin (R508200) derivative as antibacterial agent.
[Definition]

ChEBI: Rifamycin B is a carboxylic acid, an acetate ester, an organic heterotetracyclic compound and a member of rifamycins. It is a conjugate acid of a rifamycin B(2-).
[Purification Methods]

Rifamycin B forms yellow needles from *C6H6. Its solubilities are: H2O (0,027%), MeOH (2.62%) and EtOH (0.44%). It has UV max at 223, 304 and 245nm (A 1cm 555, 275 and 220). [Oppolzer & Prelog Helv Chim Acta 56 2287 1973, Oppolzer et al. Experientia 20 336 1964, X-ray: Brufani et al. Experientia 20 339 1964.]
Safety DataBack Directory
[Toxicity]

LD50 in mice (mg/kg): 2040 i.v., >3000 i.p., s.c., and orally (Sensi, 1964)
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