Chinese english Germany Korea


リファマイシンS 化学構造式
rifomycins;nci144-130;RIFAMYCIN S;RIFAMPICIN S;Rifaximin EP Impurity E;Rifaximin impurity E (EP);4-dideoxy-1,4-dihydro-1,4-dioxo-rifamycin;1,4-dideoxy-1,4-dihydro-1,4-dioxo-rifamycin;Rifamycin, 1,4-dideoxy-1,4-dihydro-1,4-dioxo-;Rifaximin Impurity 5 (Rifaximin EP Impurity E)
MOL File:

リファマイシンS 物理性質

融点 :
179-181°C (dec.)
比旋光度 :
D20 +476° (c = 0.1 in methanol)
沸点 :
700.89°C (rough estimate)
比重(密度) :
1.2387 (rough estimate)
屈折率 :
1.6630 (estimate)
外見 :
極大吸収波長 (λmax):
Merck :


RTECS 番号 KD1925000
毒性 LD50 in mice (mg/kg): 122 i.v.; 258 i.p.; 3000 orally (Sensi, 1964)

リファマイシンS 価格 もっと(7)

メーカー 製品番号 製品説明 CAS番号 包装 価格 更新時間 購入
富士フイルム和光純薬株式会社(wako) W01MAS120659
Rifampicin S
13553-79-2 5g ¥43100 2018-12-26 購入
富士フイルム和光純薬株式会社(wako) W01MAS120659
Rifampicin S
13553-79-2 25g ¥160600 2018-12-26 購入
東京化成工業 R0200 リファマイシンS >98.0%(HPLC)
Rifamycin S >98.0%(HPLC)
13553-79-2 1g ¥11000 2018-12-04 購入
東京化成工業 R0200 リファマイシンS >98.0%(HPLC)
Rifamycin S >98.0%(HPLC)
13553-79-2 5g ¥38500 2018-12-04 購入
Sigma-Aldrich Japan R0950000 European Pharmacopoeia (EP) Reference Standard
Rifamycin S European Pharmacopoeia (EP) Reference Standard
13553-79-2 r0950000 ¥33600 2018-12-25 購入

リファマイシンS 化学特性,用途語,生産方法


Semi-synthetic antibiotic.


The rifamycins are a family of antibiotics produced by an actinomycete now classified as Amycolatopsis mediterranei. All the therapeutically useful rifamycins are semisynthetic derivatives of rifamycin B, a fermentation product that is poorly active, but easily produced and readily converted chemically into rifamycin S, from which most active derivatives are prepared. They all share the general structure.
Natural products like rifamycins, which are characterized by an aromatic ring spanned by an aliphatic bridge (ansa) are called ‘ansamycins’. To this class belong the streptovaricins and the tolypomycins (chemically and biologically similar to rifamycins) and geldanamycin and the maytansines, which have quite different, antiblastic, biological activities. Among the vast number of rifamycin derivatives investigated, rifampicin (rifampin) is by far the most important and most widely used. Various others, notably rifabutin, rifapentine and rifaximin, are also in use in various parts of the world. Rifamycin SV and rifamide are much less widely available.
Interest in these antibiotics centers on their potent activity against pathogenic Gram-positive cocci and mycobacteria. Knowledge of the general properties of the group is largely based on extensive study and use of rifampicin but, insofar as they have been investigated, the main features are exhibited also by the other congeners:? Bactericidal action through inactivation of bacterial DNAdependent RNA polymerase ? Mechanism of resistance consisting of mutation of specific amino acids in the β-chain of RNA polymerase ? Relatively high frequency of resistant mutants; resistance is not horizontally transferable ? Significant biliary excretion and stimulation of hepatic metabolism. The structure of RNA polymerase is highly conserved among bacteria and when tested in cell-free systems all rifamycins present similar intrinsic activity. Differences in the minimum inhibitory concentration (MIC) values among the various congeners are caused by different abilities to penetrate into cells. Rifamycins also inhibit the RNA polymerase of eukaryotic organelles, such as mitochondria, since these are of a prokaryotic type. Some rifamycins carrying a large lipophilic chain inhibit eukaryotic RNA and DNA polymerases and viral reverse transcriptases. These effects have no clinical significance.
The different congeners differ substantially in their pharmacokinetic behavior and in their therapeutic efficacy. The principal use of rifampicin and rifapentine is in the treatment of tuberculosis and leprosy. Rifabutin is approved for the prevention of mycobacterial infections in AIDS patients. Rifampicin proved so important in the treatment of tuberculosis that in many countries its use was restricted to that indication for fear that more widespread use would encourage the emergence of resistant Mycobacterium tuberculosis strains. Those fears have proven to be exaggerated and interest has been increasingly refocused on what was originally anticipated to be an important use: treatment of severe Gram-positive infections. To prevent emergence of resistance, co-administration of another effective agent is required.
Rifaximin does not encourage emergence of resistance in mycobacteria and is used in the treatment of gastrointestinal infections. Rifamycin SV and rifamide were originally released for the treatment of infections with susceptible Gram-positive organisms and infections of the biliary tract.


The rifamycins are a group of chemically related antibioticsobtained by fermentation from cultures of Streptomycesmediterranei. They belong to a class of antibiotics called theansamycins that contain a macrocyclic ring bridged acrosstwo nonadjacent positions of an aromatic nucleus. The termansa means “handle,” describing well the topography of thestructure. The rifamycins and many of their semisynthetic derivativeshave a broad spectrum of antimicrobial activity.They are most notably active against Gram-positive bacteriaand M. tuberculosis. However, they are also active againstsome Gram-negative bacteria and many viruses. Rifampin, asemisynthetic derivative of rifamycin B, was released as anantitubercular agent in the United States in 1971. A secondsemisynthetic derivative, rifabutin, was approved in 1992 forthe treatment of atypical mycobacterial infections.
The chemistry of rifamycins and other ansamycins hasbeen reviewed. All of the rifamycins (A, B, C, D, and E) arebiologically active. Some of the semisynthetic derivatives ofrifamycin B are the most potent known inhibitors of DNAdirectedRNA polymerase in bacteria, and their action isbactericidal. They have no activity against the mammalianenzyme. The mechanism of action of rifamycins as inhibitorsof viral replication appears to differ from that for their bactericidalaction. Their net effect is to inhibit the formation of thevirus particle, apparently by preventing a specific polypeptideconversion.77 Rifamycins bind to the β subunit of bacterialDNA-dependent RNA polymerases to prevent chain initiation.78 Bacterial resistance to rifampin has been associatedwith mutations leading to amino acid substitution in the subunit.78 A high level of cross-resistance between variousrifamycins has been observed.

リファマイシンS 上流と下流の製品情報



リファマイシンS 生産企業

Global( 91)Suppliers
名前 電話番号 ファックス番号 電子メール 国籍 製品カタログ 優位度
Shenzhen Sendi Biotechnology Co.Ltd.
0755-23311925 18102838259
0755-23311925 CHINA 3217 55
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 22043 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20786 55
020-81716319 CHINA 2548 55
Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 24118 58
Hubei Jusheng Technology Co.,Ltd.
86-188-71490254 CHINA 20229 58
Haihang Industry Co.,Ltd
+86 531 8582 1093 CHINA 4525 58
Wuhan Kemi-Works Chemical Co., Ltd 86-27-85736489
86-27-85736485; China 547 57
Shanghai Boyle Chemical Co., Ltd. Mr Qiu:021-50182298(Demestic market) Miss Xu:021-50180596(Abroad market)
+86-21-57758967 China 2220 55
TCI (Shanghai) Development Co., Ltd. 021-67121386 / 800-988-0390
021-67121385 China 24648 81


  • 13553-79-2
  • 1,4-dideoxy-1,4-dihydro-1,4-dioxo-rifamycin
  • 2,7-(epoxypentadeca(1,11,13)trienimino)naphtho(2,1-b)furan-1,6,9,11(2h)-tetron
  • 4-dideoxy-1,4-dihydro-1,4-dioxo-rifamycin
  • 5,17,19,21-tetrahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-21-aceta
  • nci144-130
  • rifomycins
  • Rifamycin, 1,4-dideoxy-1,4-dihydro-1,4-dioxo-
  • 5,17,19,21-Tetrahydroxy-23-Methoxy-2,4,12,16,18,20,22-heptaMethyl-2,7-(epoxypentadeca[1,11,13]trieniMino)naphtho[2,1-b]furan-1,6,9,11(2H)-tetrone 21-Acetate
  • Rifaximin EP Impurity E
  • Rifaximin impurity E (EP)
  • Rifaximin Impurity 5 (Rifaximin EP Impurity E)
  • リファマイシンS
  • 1,4-ジデオキシ-1,4-ジヒドロ-1,4-ジオキソリファマイシン
Copyright 2017 © ChemicalBook. All rights reserved