LFF-571 is an orally bioactive, semi-synthetic tripeptide antibiotic. LFF-571 effectively inhibits Clostridium difficile and Staphylococcus aureus with MICs of 0.03 and 0.125 μg/mL respectively. LFF-571 may be utilized to study infections.

Physicochemical Properties

Molecular Formula	C60H63N13O13S6
Molecular Weight	1366.61152482033
Exact Mass	1365.299
CAS #	1160959-55-6
PubChem CID	42638236
Appearance	Typically exists as solid at room temperature
LogP	5.4
Hydrogen Bond Donor Count	8
Hydrogen Bond Acceptor Count	26
Rotatable Bond Count	17
Heavy Atom Count	92
Complexity	2570
Defined Atom Stereocenter Count	4
SMILES	CC1=C2C(=O)N[C@H](C3=NC(=C(S3)COC)C(=O)NCC(=O)N[C@H](C4=NC(=CS4)C5=NC(=CS5)C6=C(C=CC(=N6)C7=NC(=CS7)N(CCCCC(=O)O)C(=O)OC8CCC(CC8)C(=O)O)C9=NC(=CS9)C(=O)N[C@H](C(=N2)S1)CC(=O)NC)[C@H](C1=CC=CC=C1)O)C(C)C
InChi Key	GNLYKLDXQZHYTR-QWSGWXDSSA-N
InChi Code	InChI=1S/C60H63N13O13S6/c1-28(2)44-58-72-47(39(92-58)23-85-5)51(80)62-22-42(75)69-48(49(78)30-11-7-6-8-12-30)57-67-38(26-89-57)55-65-36(24-88-55)46-33(53-66-37(25-87-53)50(79)64-35(21-41(74)61-4)56-71-45(29(3)91-56)52(81)70-44)18-19-34(63-46)54-68-40(27-90-54)73(20-10-9-13-43(76)77)60(84)86-32-16-14-31(15-17-32)59(82)83/h6-8,11-12,18-19,24-28,31-32,35,44,48-49,78H,9-10,13-17,20-23H2,1-5H3,(H,61,74)(H,62,80)(H,64,79)(H,69,75)(H,70,81)(H,76,77)(H,82,83)/t31?,32?,35-,44-,48-,49-/m0/s1
Chemical Name	4-[4-carboxybutyl-[2-[(18S,25S,35S)-35-[(S)-hydroxy(phenyl)methyl]-28-(methoxymethyl)-21-methyl-18-[2-(methylamino)-2-oxoethyl]-16,23,30,33-tetraoxo-25-propan-2-yl-3,13,20,27,37-pentathia-7,17,24,31,34,39,40,41,42,43-decazaheptacyclo[34.2.1.12,5.112,15.119,22.126,29.06,11]tritetraconta-1(38),2(43),4,6(11),7,9,12(42),14,19(41),21,26(40),28,36(39)-tridecaen-8-yl]-1,3-thiazol-4-yl]carbamoyl]oxycyclohexane-1-carboxylic acid
Synonyms	LFF 571; LFF571; LFF-571
HS Tariff Code	2934.99.9001
Storage	Powder-20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month
Shipping Condition	Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

Biological Activity

ln Vitro	LFF-571 (0-32 μg/mL) had minimum inhibitory concentrations (MICs) of less than 0.06, 0.125, 1, 0.03 μg, 0.125, 0.125, and Enterococcus faecalis, Staphylococcus aureus, and Streptococcus pyogenes, respectively. /mL, in that order [1].
ln Vivo	LFF-571 can make infected hamsters survive if given orally once daily for five days at doses of two and twenty mg/kg [1].
Animal Protocol	Animal/Disease Models: Clostridium difficile-infected golden Syrian hamsters [1] Doses: 2 and 20 mg/kg Route of Administration: po (oral gavage); 2 and 20 mg/kg one time/day for 5 days Experimental Results: demonstrated significant effect on infected hamsters Dose-dependent effects on survival.
References	[1]. LaMarche MJ, et al. Discovery of LFF571: an investigational agent for Clostridium difficile infection. J Med Chem. 2012 Mar 8;55(5):2376-87.
Additional Infomation	LFF571 has been used in trials studying the treatment of Moderate Clostridium Difficile Infection.

Solubility Data

Solubility (In Vitro)

May dissolve in DMSO (in most cases), if not, try other solvents such as H2O, Ethanol, or DMF with a minute amount of products to avoid loss of samples

Solubility (In Vivo)

Note: Listed below are some common formulations that may be used to formulate products with low water solubility (e.g. < 1 mg/mL), you may test these formulations using a minute amount of products to avoid loss of samples. Injection Formulations (e.g. IP/IV/IM/SC) Injection Formulation 1: DMSO : Tween 80： Saline = 10 : 5 : 85 (i.e. 100 μL DMSO stock solution → 50 μL Tween 80 → 850 μL Saline) *Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH ₂ O to obtain a clear solution. Injection Formulation 2: DMSO : PEG300 ：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL DMSO → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline) Injection Formulation 3: DMSO : Corn oil = 10 : 90 (i.e. 100 μL DMSO → 900 μL Corn oil) Example: Take the Injection Formulation 3 (DMSO : Corn oil = 10 : 90) as an example, if 1 mL of 2.5 mg/mL working solution is to be prepared, you can take 100 μL 25 mg/mL DMSO stock solution and add to 900 μL corn oil, mix well to obtain a clear or suspension solution (2.5 mg/mL, ready for use in animals). Injection Formulation 4: DMSO : 20% SBE-β-CD in saline = 10 : 90 [i.e. 100 μL DMSO → 900 μL (20% SBE-β-CD in saline)] *Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution. Injection Formulation 5: 2-Hydroxypropyl-β-cyclodextrin : Saline = 50 : 50 (i.e. 500 μL 2-Hydroxypropyl-β-cyclodextrin → 500 μL Saline) Injection Formulation 6: DMSO : PEG300 : castor oil : Saline = 5 : 10 : 20 : 65 (i.e. 50 μL DMSO → 100 μLPEG300 → 200 μL castor oil → 650 μL Saline) Injection Formulation 7: Ethanol : Cremophor : Saline = 10： 10 : 80 (i.e. 100 μL Ethanol → 100 μL Cremophor → 800 μL Saline) Injection Formulation 8: Dissolve in Cremophor/Ethanol (50 : 50), then diluted by Saline Injection Formulation 9: EtOH : Corn oil = 10 : 90 (i.e. 100 μL EtOH → 900 μL Corn oil) Injection Formulation 10: EtOH : PEG300：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL EtOH → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline) Oral Formulations Oral Formulation 1: Suspend in 0.5% CMC Na (carboxymethylcellulose sodium) Oral Formulation 2: Suspend in 0.5% Carboxymethyl cellulose Example: Take the Oral Formulation 1 (Suspend in 0.5% CMC Na) as an example, if 100 mL of 2.5 mg/mL working solution is to be prepared, you can first prepare 0.5% CMC Na solution by measuring 0.5 g CMC Na and dissolve it in 100 mL ddH2O to obtain a clear solution; then add 250 mg of the product to 100 mL 0.5% CMC Na solution, to make the suspension solution (2.5 mg/mL, ready for use in animals). Oral Formulation 3: Dissolved in PEG400 Oral Formulation 4: Suspend in 0.2% Carboxymethyl cellulose Oral Formulation 5: Dissolve in 0.25% Tween 80 and 0.5% Carboxymethyl cellulose Oral Formulation 6: Mixing with food powders Note: Please be aware that the above formulations are for reference only. InvivoChem strongly recommends customers to read literature methods/protocols carefully before determining which formulation you should use for in vivo studies, as different compounds have different solubility properties and have to be formulated differently.  (Please use freshly prepared in vivo formulations for optimal results.)

Preparing Stock Solutions		1 mg	5 mg	10 mg
	1 mM	0.7317 mL	3.6587 mL	7.3174 mL
	5 mM	0.1463 mL	0.7317 mL	1.4635 mL
	10 mM	0.0732 mL	0.3659 mL	0.7317 mL

*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.