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Accession NumberDB00293  (APRD00430, EXPT01092)
TypeSmall Molecule
GroupsApproved, Investigational

Raltitrexed (brand name Tomudex®) is a chemotherapy drug manufactured AstraZeneca Company, is an antimetabolite used in chemotherapy. It is an inhibitor of thymidylate synthase.

External Identifiers
  • ZD 1694
  • ZD-1694
Approved Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing End
Tomudexpowder for solution2 mgintravenousHospira Healthcare Corporation1996-11-18Not applicableCanada
Approved Generic Prescription ProductsNot Available
Approved Over the Counter ProductsNot Available
Unapproved/Other Products Not Available
International BrandsNot Available
Brand mixturesNot Available
SaltsNot Available
CAS number112887-68-0
WeightAverage: 458.488
Monoisotopic: 458.126005146
Chemical FormulaC21H22N4O6S
(2S)-2-[(5-{methyl[(2-methyl-4-oxo-1,4-dihydroquinazolin-6-yl)methyl]amino}thiophen-2-yl)formamido]pentanedioic acid
DescriptionThis compound belongs to the class of organic compounds known as n-acyl-alpha amino acids. These are compounds containing an alpha amino acid which bears an acyl group at its terminal nitrogen atom.
KingdomOrganic compounds
Super ClassOrganic acids and derivatives
ClassCarboxylic acids and derivatives
Sub ClassAmino acids, peptides, and analogues
Direct ParentN-acyl-alpha amino acids
Alternative Parents
  • N-acyl-alpha-amino acid
  • Quinazoline
  • Dialkylarylamine
  • Thiophene carboxylic acid or derivatives
  • Thiophene carboxamide
  • Benzylamine
  • 2,5-disubstituted thiophene
  • Pyrimidone
  • Amino fatty acid
  • Fatty acyl
  • Benzenoid
  • Pyrimidine
  • Dicarboxylic acid or derivatives
  • Heteroaromatic compound
  • Vinylogous amide
  • Thiophene
  • Tertiary amine
  • Secondary carboxylic acid amide
  • Carboxamide group
  • Azacycle
  • Organoheterocyclic compound
  • Carboxylic acid
  • Hydrocarbon derivative
  • Organooxygen compound
  • Organonitrogen compound
  • Carbonyl group
  • Amine
  • Aromatic heteropolycyclic compound
Molecular FrameworkAromatic heteropolycyclic compounds
External DescriptorsNot Available
IndicationFor the treatment of malignant neoplasm of colon and rectum
PharmacodynamicsRaltitrexed belongs to a group of medicines known as antimetabolites. It is used to treat cancer of the colon and rectum. It may also be used to treat other kinds of cancer, as determined by your doctor. Raltitrexed blocks an enzyme needed by the cell to live. This interferes with the growth of cancer cells, which are eventually destroyed. Since the growth of normal body cells may also be affected by raltitrexed, other effects will also occur. Some of these may be serious and must be reported to your doctor. Other effects, like hair loss, may not be serious but may cause concern.
Mechanism of actionRaltitrexed is an antineoplastic Agents and folic acid antagonists. Raltitrexed inhibits thymidylate synthase (TS) leading to DNA fragmentation and cell death. It is transported into cells via a reduced folate carrier. Inside the cell Raltitrexed is extensively polyglutamated, which enhances thymidylate synthase inhibitory power and duration. Inhibition of this enzyme results in decreased synthesis of thymidine triphosphate which is required for DNA synthesis.
Related Articles
AbsorptionNot Available
Volume of distributionNot Available
Protein binding>93%

Raltitrexed is transported into cells via a reduced folate carrier. Inside the cell it is extensively polyglutamated by the enzyme folyl polyglutamate synthetase to polyglutamate forms.

Route of eliminationNot Available
Half life198 hours
ClearanceNot Available
ToxicitySide effects include pale skin, troubled breathing, unusual bleeding or bruising, unusual tiredness or weakness, black, tarry stools, chest pain, chills, cough, fever, painful or difficult urination, shortness of breath, sore throat, sores, ulcers, or white spots on lips or in mouth, swollen glands, increase in bowel movements, loose stools, soft stools.
Affected organisms
  • Humans and other mammals
PathwaysNot Available
SNP Mediated EffectsNot Available
SNP Mediated Adverse Drug ReactionsNot Available
Predicted ADMET features
Human Intestinal Absorption-0.6717
Blood Brain Barrier-0.9044
Caco-2 permeable-0.7873
P-glycoprotein substrateSubstrate0.7093
P-glycoprotein inhibitor INon-inhibitor0.9214
P-glycoprotein inhibitor IINon-inhibitor0.9588
Renal organic cation transporterNon-inhibitor0.8799
CYP450 2C9 substrateNon-substrate0.7133
CYP450 2D6 substrateNon-substrate0.8077
CYP450 3A4 substrateSubstrate0.6032
CYP450 1A2 substrateNon-inhibitor0.7801
CYP450 2C9 inhibitorNon-inhibitor0.5435
CYP450 2D6 inhibitorNon-inhibitor0.942
CYP450 2C19 inhibitorNon-inhibitor0.6909
CYP450 3A4 inhibitorNon-inhibitor0.8447
CYP450 inhibitory promiscuityLow CYP Inhibitory Promiscuity0.8351
Ames testNon AMES toxic0.7287
BiodegradationNot ready biodegradable0.9637
Rat acute toxicity2.4511 LD50, mol/kg Not applicable
hERG inhibition (predictor I)Weak inhibitor0.9819
hERG inhibition (predictor II)Non-inhibitor0.6763
ADMET data is predicted using admetSAR, a free tool for evaluating chemical ADMET properties. (23092397 )
ManufacturersNot Available
PackagersNot Available
Dosage forms
Powder for solutionintravenous2 mg
PricesNot Available
PatentsNot Available
Experimental Properties
melting point180-184 °CNot Available
water solubilitysolubleNot Available
logP-1.2Not Available
Predicted Properties
Water Solubility0.0181 mg/mLALOGPS
pKa (Strongest Acidic)3.72ChemAxon
pKa (Strongest Basic)-0.46ChemAxon
Physiological Charge-2ChemAxon
Hydrogen Acceptor Count9ChemAxon
Hydrogen Donor Count4ChemAxon
Polar Surface Area148.4 Å2ChemAxon
Rotatable Bond Count9ChemAxon
Refractivity117.39 m3·mol-1ChemAxon
Polarizability45.55 Å3ChemAxon
Number of Rings3ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Mass Spec (NIST)Not Available
SpectraNot Available
Synthesis Reference

General ReferencesNot Available
External Links
ATC CodesL01BA03
AHFS Codes
  • 92:00.00
PDB EntriesNot Available
FDA labelNot Available
MSDSDownload (57 KB)
Drug Interactions
ClozapineThe risk or severity of adverse effects can be increased when Raltitrexed is combined with Clozapine.
Folic AcidThe therapeutic efficacy of Raltitrexed can be decreased when used in combination with Folic Acid.
LeucovorinThe therapeutic efficacy of Raltitrexed can be decreased when used in combination with Leucovorin.
LevomefolateThe therapeutic efficacy of Raltitrexed can be decreased when used in combination with Levomefolate.
MetamizoleThe risk or severity of adverse effects can be increased when Metamizole is combined with Raltitrexed.
Food InteractionsNot Available


Pharmacological action
General Function:
Thymidylate synthase activity
Specific Function:
Contributes to the de novo mitochondrial thymidylate biosynthesis pathway.
Gene Name:
Uniprot ID:
Molecular Weight:
35715.65 Da
  1. Yin MB, Guo B, Panadero A, Frank C, Wrzosek C, Slocum HK, Rustum YM: Cyclin E-cdk2 activation is associated with cell cycle arrest and inhibition of DNA replication induced by the thymidylate synthase inhibitor Tomudex. Exp Cell Res. 1999 Feb 25;247(1):189-99. [PubMed:10047461 ]
  2. Cao S, McGuire JJ, Rustum YM: Antitumor activity of ZD1694 (tomudex) against human head and neck cancer in nude mouse models: role of dosing schedule and plasma thymidine. Clin Cancer Res. 1999 Jul;5(7):1925-34. [PubMed:10430100 ]
  3. Ferguson PJ, Collins O, Dean NM, DeMoor J, Li CS, Vincent MD, Koropatnick J: Antisense down-regulation of thymidylate synthase to suppress growth and enhance cytotoxicity of 5-FUdR, 5-FU and Tomudex in HeLa cells. Br J Pharmacol. 1999 Aug;127(8):1777-86. [PubMed:10482907 ]
  4. Orlandi L, Bearzatto A, Abolafio G, De Marco C, Daidone MG, Zaffaroni N: Involvement of bcl-2 and p21waf1 proteins in response of human breast cancer cell clones to Tomudex. Br J Cancer. 1999 Sep;81(2):252-60. [PubMed:10496350 ]
  5. Grem JL, Sorensen JM, Cullen E, Takimoto CH, Steinberg SM, Chen AP, Hamilton JM, Arbuck SG, McAtee N, Lawrence D, Goldspiel B, Johnston PG, Allegra CJ: A Phase I study of raltitrexed, an antifolate thymidylate synthase inhibitor, in adult patients with advanced solid tumors. Clin Cancer Res. 1999 Sep;5(9):2381-91. [PubMed:10499608 ]
  6. Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. [PubMed:11752352 ]
  7. Yang Z, Waldman AS, Wyatt MD: DNA damage and homologous recombination signaling induced by thymidylate deprivation. Biochem Pharmacol. 2008 Oct 15;76(8):987-96. doi: 10.1016/j.bcp.2008.08.010. Epub 2008 Aug 19. [PubMed:18773878 ]
  8. Chen VJ, Bewley JR, Andis SL, Schultz RM, Iversen PW, Shih C, Mendelsohn LG, Seitz DE, Tonkinson JL: Cellular pharmacology of MTA: a correlation of MTA-induced cellular toxicity and in vitro enzyme inhibition with its effect on intracellular folate and nucleoside triphosphate pools in CCRF-CEM cells. Semin Oncol. 1999 Apr;26(2 Suppl 6):48-54. [PubMed:10598555 ]
  9. Berman HM, Westbrook J, Feng Z, Gilliland G, Bhat TN, Weissig H, Shindyalov IN, Bourne PE: The Protein Data Bank. Nucleic Acids Res. 2000 Jan 1;28(1):235-42. [PubMed:10592235 ]
Pharmacological action
General Function:
Tetrahydrofolylpolyglutamate synthase activity
Specific Function:
Catalyzes conversion of folates to polyglutamate derivatives allowing concentration of folate compounds in the cell and the intracellular retention of these cofactors, which are important substrates for most of the folate-dependent enzymes that are involved in one-carbon transfer reactions involved in purine, pyrimidine and amino acid synthesis. Unsubstituted reduced folates are the preferred s...
Gene Name:
Uniprot ID:
Molecular Weight:
64608.53 Da
  1. Innocenti F, Ratain MJ: Update on pharmacogenetics in cancer chemotherapy. Eur J Cancer. 2002 Mar;38(5):639-44. [PubMed:11916544 ]
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Drug created on June 13, 2005 07:24 / Updated on October 08, 2013 14:25