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Folinic acid (Leucovorin)

Name: Folinic acid (Leucovorin)
Brand: Selleck Chemicals
SKU: S5790
Availability: InStock
Rating: 5 (2 reviews)

Cat.No.S5790

Folinic acid (Leucovorin) is a biological folic acid that increases the level of reduced folates in tissues, which promotes the inhibition of thymidylate synthase (TS).Solutions are unstable and should be fresh-prepared.

Chemical Structure

Molecular Weight: 473.44

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Quality Control

Batch: Purity: 99.70%

99.70

Related Targets	Dehydrogenase HSP Transferase P450 (e.g. CYP17) PDE phosphatase PPAR Vitamin Carbohydrate Metabolism Mitochondrial Metabolism
Other Endogenous Metabolite Inhibitors	4-HNE (4-Hydroxynonenal) Heparan Sulfate Oleic acid (cis-9-Octadecenoic acid) Ademetionine (S-Adenosylmethionine) Sodium L-lactate 3-Hydroxybutyric acid (BHB acid)

Solubility

In vitro
Batch:

DMSO : 180 mg/mL (380.19 mM) Ultrasonicated;
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Water : Insoluble

Ethanol : Insoluble

Molarity Calculator

Mass	Concentration	Volume	Molecular Weight
Mass value Mass unit	Concentration value Concentration unit	Volume value Volume unit	Molecular weight (g/mol)

Dilution Calculator Molecular Weight Calculator

In vivo batch selection In vivo Batch:
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	5%DMSO 1 40%PEG300 2 5%Tween80 3 50%ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	9.000mg/ml (19.01mM)	Taking the 1 mL working solution as an example, add 50 μL of 180 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 500 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Clear solution	5% DMSO 1 95% Corn oil Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	0.800mg/ml (1.69mM)	Taking the 1 mL working solution as an example, add 50 μL of 16 mg/ml clear DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

Dosage: mg/kg

Average weight of animals: g

Dosing volume per animal: μL

Number of animals:

Step 2: Enter the in vivo formulation (This is only the calculator, not formulation. Please contact us first if there is no in vivo formulation at the solubility Section.)

% DMSO

% Tween 80

% ddH₂O

% DMSO

Calculation results:

Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH₂O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Chemical Information, Storage & Stability

Molecular Weight	473.44	Formula	C₂₀H₂₃N₇O₇	Storage (From the date of receipt)	3 years -20°C powder
CAS No.	58-05-9	--		Storage of Stock Solutions	Solutions are unstable. Prepare fresh or purchase small, pre-packaged sizes. Repackage upon receipt.

Read more about storage stability CAS number

Mechanism of Action

Targets/IC₅₀/Ki	Thymidylate Synthase
References	[1] https://pubmed.ncbi.nlm.nih.gov/1516048/

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2026-06-18)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT06365008	NOT_YET_RECRUITING	Unresectable/Metastatic Gastric Cancer	Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University	2026-06	PHASE2
NCT06780111	RECRUITING	Esophageal Squamous Cell Carcinoma	Merck Sharp & Dohme LLC	2025-07-30	PHASE1; PHASE2
NCT03801876	ACTIVE_NOT_RECRUITING	Clinical Stage I Esophageal Adenocarcinoma AJCC v8; Clinical Stage I Esophageal Squamous Cell Carcinoma AJCC v8; Clinical Stage I Gastroesophageal Junction Adenocarcinoma AJCC v8; Clinical Stage II Esophageal Adenocarcinoma AJCC v8; Clinical Stage II Esophageal Squamous Cell Carcinoma AJCC v8; Clinical Stage II Gastroesophageal Junction Adenocarcinoma AJCC v8; Clinical Stage III Esophageal Adenocarcinoma AJCC v8; Clinical Stage III Esophageal Squamous Cell Carcinoma AJCC v8; Clinical Stage III Gastroesophageal Junction Adenocarcinoma AJCC v8; Clinical Stage IVA Esophageal Adenocarcinoma AJCC v8; Clinical Stage IVA Esophageal Squamous Cell Carcinoma AJCC v8; Clinical Stage IVA Gastroesophageal Junction Adenocarcinoma AJCC v8; Thoracic Esophagus Squamous Cell Carcinoma	NRG Oncology	2019-06-26	PHASE3
NCT06988852	RECRUITING	Colorectal Liver Metastasis (CRLM)	Tongji Hospital	2023-05-01	PHASE2
NCT00004317	RECRUITING	Toxoplasmosis	National Institute of Allergy and Infectious Diseases (NIAID)	2000-07	PHASE4
NCT06958328	RECRUITING	Locally Advanced Unresectable Pancreatic Ductal Adenocarcinoma; Stage II Pancreatic Cancer AJCC v8; Stage III Pancreatic Cancer AJCC v8; Stage IV Pancreatic Cancer AJCC v8	NRG Oncology	2025-08-21	PHASE3

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Handling Instructions

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