Title: Dalfopristin
CAS Registry Number: 112362-50-2
CAS Name: (26R,27S)-26-[[2-(Diethylamino)ethyl]sulfonyl]-26,27-dihydrovirginiamycin M1
Additional Names: 26-(2-diethylaminoethyl)sulfonylpristinamycin IIB
Manufacturers' Codes: RP-54476
Molecular Formula: C34H50N4O9S
Molecular Weight: 690.85
Percent Composition: C 59.11%, H 7.29%, N 8.11%, O 20.84%, S 4.64%
Literature References: Semisynthetic polyunsaturated macrolactone type II streptogramin, q.v. Prepn: J.-C. Barriere et al., EP 191662; eidem, US 4668669 (1986, 1987 both to Rhone-Poulenc). In vitro activity: H. C. Neu et al., J. Antimicrob. Chemother. 30, Suppl. A, 83 (1992). HPLC determn in plasma: A. Le Liboux et al., J. Chromatogr. B 708, 161 (1998)
Properties: White solid, mp ~150°.
Melting point: mp ~150°
Derivative Type: Mixture with quinupristin
CAS Registry Number: 126602-89-9
Manufacturers' Codes: RP-59500
Trademarks: Synercid (Rh>e-Poulenc)
Literature References: Semisynthetic streptogramin comprised of two synergistic components in a defined 70:30 percent w/w mixture of dalfopristin and quinupristin, q.v., mesylate salts. HPLC determn for quality control: B. Vasselle et al., J. Pharm. Biomed. Anal. 19, 641 (1999). In vitro activity in comparison with pristinamycin, q.v.: A. Lozniewski et al., Pathol. Biol. 48, 463 (2000). Clinical trial in vancomycin resistant Enterococcus faecium (VREF) infection: R. C. Moellering et al., J. Antimicrob. Chemother. 44, 251 (1999); in skin infections: R. L. Nichols et al., ibid. 263. Review: B. Pavan, Curr. Opin. Invest. Drugs 1, 173-180 (2000).
Therap-Cat: Antibacterial.
Keywords: Antibacterial (Antibiotics).
D-Allose Dalteparin Daltroban D-Altrose Damar

Systematic (IUPAC) name
(3R,4R,5E,10E,12E,14S,26R,26aS)-26-[[2-(diethylamino)ethyl]sulfonyl]-8,9,14,15,24,25,26,26a- octahydro-14-hydroxy-3-isopropyl-4,12-dimethyl-3H-21,18-nitrilo-1H,22H-pyrrolo[2,1-c][1,8,4,19]-dioxadiazacyclotetracosine-1,7,16,22(4H,17H)-tetrone
Clinical data
AHFS/Drugs.com International Drug Names
MedlinePlus a603007
Legal status -only (US)
Pharmacokinetic data
Half-life 1 hour
CAS number 112362-50-2 YesY
ATC code None
PubChem CID 6435782
DrugBank DB01764
ChemSpider 4940480 N
KEGG D00853 N
Chemical data
Formula C34H50N4O9S 
Mol. mass 690.85 g/mol
 N (what is this?)  (verify)

Dalfopristin is a semi-synthetic streptogramin antibiotic analogue of ostreogyrcin A (virginiamycin M, pristinamycin IIA, streptogramin A).[1] The combination quinupristin/dalfopristin (marketed under the trade name Synercid) was brought to the market by Rhone-Poulenc Rorer Pharmaceuticals in 1999.[2] Synercid (weight-to-weight ratio of 30% quinupristin to 70% dalfopristin) is used to treat infections by staphylococci and by vancomycin-resistant Enterococcus faecium.[3]