Topoisomerase

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  1. Levofloxacin hydrochloride
    CAS: 177325-13-2 Formula: C18H21ClFN3O4 Molecular Weight: 397.83
    ● In Stock — US warehouse, ships to EU* Item #: L305201
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    IUPAC Name
    (2S)-7-fluoro-2-methyl-6-(4-methylpiperazin-1-yl)-10-oxo-4-oxa-1-azatricyclo[7.3.1.05,13]trideca-5(13),6,8,11-tetraene-11-carboxylic acid;hydrochloridshow more
    SMILES
    CC1COC2=C3N1C=C(C(=O)C3=CC(=C2N4CCN(CC4)C)F)C(=O)O.Cl
    InChIKey
    CAOOISJXWZMLBN-PPHPATTJSA-N
    InChI
    1S/C18H20FN3O4.ClH/c1-10-9-26-17-14-11(16(23)12(18(24)25)8-22(10)14)7-13(19)15(17)21-5-3-20(2)4-6-21;/h7-8,10H,3-6,9H2,1-2H3,(H,24,25);1H/t10-;/m0./s1
    Synonyms
    Weilisu | Levofloxacin (hydrochloride) | (S)-9-Fluoro-3-methyl-10-(4-methylpiperazin-1-yl)-7-oxo-3,7-dihydro-2H-[1,4]...
  2. Levofloxacin
    CAS: 100986-85-4 EC Number: 600-146-0 Formula: C18H20FN3O4 Molecular Weight: 361.37
    Solid Moligand™ ? Moligand™ — Aladdin's line of ligands and bioactive small molecules. Use for receptor, pathway, and binding studies needing defined small-molecule tools. ≥98%(HPLC)
    ● In Stock — US warehouse, ships to EU* Item #: L157745
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    IUPAC Name
    (2S)-7-fluoro-2-methyl-6-(4-methylpiperazin-1-yl)-10-oxo-4-oxa-1-azatricyclo[7.3.1.05,13]trideca-5(13),6,8,11-tetraene-11-carboxylic acid
    SMILES
    CC1COC2=C3N1C=C(C(=O)C3=CC(=C2N4CCN(CC4)C)F)C(=O)O
    InChIKey
    GSDSWSVVBLHKDQ-JTQLQIEISA-N
    InChI
    1S/C18H20FN3O4/c1-10-9-26-17-14-11(16(23)12(18(24)25)8-22(10)14)7-13(19)15(17)21-5-3-20(2)4-6-21/h7-8,10H,3-6,9H2,1-2H3,(H,24,25)/t10-/m0/s1
    Synonyms
    1-bromo-2-trifluoromethyl benzene | o,.alpha.,.alpha.,.alpha.-Tetrafluorotoluene | GTPL10911 | KBio2_002199 | Levoflo...
  3. Levofloxacin hemihydrate
    CAS: 138199-71-0 EC Number: 604-067-2 PubChem CID: 3033924 Formula: C18H20FN3O4 · 0.5H2O Molecular Weight: 370.38
    ● In Stock — US warehouse, ships to EU* Item #: L190773
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    IUPAC Name
    (2S)-7-fluoro-2-methyl-6-(4-methylpiperazin-1-yl)-10-oxo-4-oxa-1-azatricyclo[7.3.1.05,13]trideca-5(13),6,8,11-tetraene-11-carboxylic acid;hydrate
    SMILES
    CC1COC2=C3N1C=C(C(=O)C3=CC(=C2N4CCN(CC4)C)F)C(=O)O.CC1COC2=C3N1C=C(C(=O)C3=CC(=C2N4CCN(CC4)C)F)C(=O)O.O
    InChIKey
    SUIQUYDRLGGZOL-RCWTXCDDSA-N
    InChI
    1S/2C18H20FN3O4.H2O/c2*1-10-9-26-17-14-11(16(23)12(18(24)25)8-22(10)14)7-13(19)15(17)21-5-3-20(2)4-6-21;/h2*7-8,10H,3-6,9H2,1-2H3,(H,24,25);1H2/t2*10-show more
    Synonyms
    EN300-20644132 | Levofloxacin (USP) | 6GNT3Y5LMF | Levofloxacin Hemihydrate, Pharmaceutical Secondary Standard; Certi...
  4. Mitoxantrone, Inhibitor of DNA topoisomerase II alpha
    CAS: 65271-80-9 EC Number: 833-758-3 Formula: C22H28N4O6 Molecular Weight: 444.48
    Solid Moligand™ ? Moligand™ — Aladdin's line of ligands and bioactive small molecules. Use for receptor, pathway, and binding studies needing defined small-molecule tools. ≥97%
    ● In Stock — US warehouse, ships to EU* Item #: M339846
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    IUPAC Name
    1,4-dihydroxy-5,8-bis[2-(2-hydroxyethylamino)ethylamino]anthracene-9,10-dione
    SMILES
    C1=CC(=C2C(=C1NCCNCCO)C(=O)C3=C(C=CC(=C3C2=O)O)O)NCCNCCO
    InChIKey
    KKZJGLLVHKMTCM-UHFFFAOYSA-N
    InChI
    1S/C22H28N4O6/c27-11-9-23-5-7-25-13-1-2-14(26-8-6-24-10-12-28)18-17(13)21(31)19-15(29)3-4-16(30)20(19)22(18)32/h1-4,23-30H,5-12H2
    Synonyms
    L01DB07 | 5,8-Bis((2-((2-hydroxyethyl)amino)ethyl)amino)-1,4-dihydroxyanthraquinone | HMS2090D05 | 1,4-dihydroxy-5,8-...
  5. Levofloxacin mesylate
    CAS: 226578-51-4 PubChem CID: 46191666 Formula: C18H20FN3O4.CH4O3S Molecular Weight: 457.47
    ◐ .Made to order · 8–12 wks Item #: L182973
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    IUPAC Name
    (2S)-7-fluoro-2-methyl-6-(4-methylpiperazin-1-yl)-10-oxo-4-oxa-1-azatricyclo[7.3.1.05,13]trideca-5(13),6,8,11-tetraene-11-carboxylic acid;methanesulfoshow more
    SMILES
    CC1COC2=C3N1C=C(C(=O)C3=CC(=C2N4CCN(CC4)C)F)C(=O)O.CS(=O)(=O)O
    InChIKey
    ZSPLOATUDIRNAS-PPHPATTJSA-N
    InChI
    1S/C18H20FN3O4.CH4O3S/c1-10-9-26-17-14-11(16(23)12(18(24)25)8-22(10)14)7-13(19)15(17)21-5-3-20(2)4-6-21;1-5(2,3)4/h7-8,10H,3-6,9H2,1-2H3,(H,24,25);1H3show more
    Synonyms
    7H-Pyrido(1,2,3-de)-1,4-benzoxazine-6-carboxylic acid, 9-fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-ox...
  6. Ciprofloxacin Hydrochloride Monohydrate
    CAS: 86393-32-0 EC Number: 617-845-1 Formula: C17H18FN3O3·HCl·H2O Molecular Weight: 367.81(as Anhydrous)
    Solid Analytical standard ? Analytical standard — certified-purity material for quantitative calibration. Use to prepare calibration standards and validate analytical methods.
    ◐ .Made to order · 8–12 wks Item #: C114253
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    IUPAC Name
    1-cyclopropyl-6-fluoro-4-oxo-7-piperazin-1-ylquinoline-3-carboxylic acid;hydrate;hydrochloride
    SMILES
    C1CC1N2C=C(C(=O)C3=CC(=C(C=C32)N4CCNCC4)F)C(=O)O.O.Cl
    InChIKey
    ARPUHYJMCVWYCZ-UHFFFAOYSA-N
    InChI
    1S/C17H18FN3O3.ClH.H2O/c18-13-7-11-14(8-15(13)20-5-3-19-4-6-20)21(10-1-2-10)9-12(16(11)22)17(23)24;;/h7-10,19H,1-6H2,(H,23,24);1H;1H2
    Synonyms
    Microgan | Phaproxin | Bay-o-9867 monohydrate | Ciprofloxacin (hydrochloride monohydrate) | Catex | Ciprofur | Plenol...
  7. Ciprofloxacin lactate
    CAS: 97867-33-9 Formula: C20H24FN3O6 Molecular Weight: 421.43
    ● In Stock — US warehouse, ships to EU* Item #: C131636
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    IUPAC Name
    1-cyclopropyl-6-fluoro-4-oxo-7-piperazin-1-ylquinoline-3-carboxylic acid;2-hydroxypropanoic acid
    SMILES
    CC(C(=O)O)O.C1CC1N2C=C(C(=O)C3=CC(=C(C=C32)N4CCNCC4)F)C(=O)O
    InChIKey
    NRBJWZSFNGZBFQ-UHFFFAOYSA-N
    InChI
    1S/C17H18FN3O3.C3H6O3/c18-13-7-11-14(8-15(13)20-5-3-19-4-6-20)21(10-1-2-10)9-12(16(11)22)17(23)24;1-2(4)3(5)6/h7-10,19H,1-6H2,(H,23,24);2,4H,1H3,(H,5,show more
    Synonyms
    1-cyclopropyl-6-fluoro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid; 2-hydroxypropanoic acid | alpha-?hydroxy-?...
  8. Anthraquinone
    CAS: 84-65-1 EC Number: 201-549-0 Formula: C14H8O2 Molecular Weight: 208.21
    Melting point standard ? Melting-point standard — certified material with a known, sharp melting point. Use to calibrate and verify melting-point apparatus.
    ● In Stock — US warehouse, ships to EU* Item #: A119546
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    IUPAC Name
    anthracene-9,10-dione
    SMILES
    C1=CC=C2C(=C1)C(=O)C3=CC=CC=C3C2=O
    InChIKey
    RZVHIXYEVGDQDX-UHFFFAOYSA-N
    InChI
    1S/C14H8O2/c15-13-9-5-1-2-6-10(9)14(16)12-8-4-3-7-11(12)13/h1-8H
    Synonyms
    Anthracene,10-dihydro-9,10-dioxo- | Anthraquinone, 97% | Spectrum3_001501 | Morkit | 9,10-dihydroanthracene-9,10-dion...
  9. Rebeccamycin
    CAS: 93908-02-2 PubChem CID: 73110 Formula: C27H21Cl2N3O7 Molecular Weight: 570.38
    ◐ .Made to order · 8–12 wks Item #: R276440
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    IUPAC Name
    5,21-dichloro-3-[(2R,3R,4R,5S,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-methoxyoxan-2-yl]-3,13,23-triazahexacyclo[14.7.0.02,10.04,9.011,15.017,22]tricosa-show more
    SMILES
    COC1C(OC(C(C1O)O)N2C3=C(C=CC=C3Cl)C4=C5C(=C6C7=C(C(=CC=C7)Cl)NC6=C42)C(=O)NC5=O)CO
    InChIKey
    QEHOIJJIZXRMAN-QZQSLCQPSA-N
    InChI
    1S/C27H21Cl2N3O7/c1-38-24-13(8-33)39-27(23(35)22(24)34)32-20-10(5-3-7-12(20)29)15-17-16(25(36)31-26(17)37)14-9-4-2-6-11(28)18(9)30-19(14)21(15)32/h2-7show more
    Synonyms
    HY-19825 | 1,11-dichloro-12-(3,4-dihydroxy-6-hydroxymethyl-5-methoxytetrahydro-2H-2-pyranyl)-6,7,12,13-tetrahydro-5H-...
  10. Amsacrine, DNA topoisomerase II inhibitor
    CAS: 51264-14-3 EC Number: 257-094-3 Formula: C21H19N3O3S Molecular Weight: 393.46
    ● In Stock — US warehouse, ships to EU* Item #: A303844
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    IUPAC Name
    N-[4-(acridin-9-ylamino)-3-methoxyphenyl]methanesulfonamide
    SMILES
    COC1=C(C=CC(=C1)NS(=O)(=O)C)NC2=C3C=CC=CC3=NC4=CC=CC=C42
    InChIKey
    XCPGHVQEEXUHNC-UHFFFAOYSA-N
    InChI
    1S/C21H19N3O3S/c1-27-20-13-14(24-28(2,25)26)11-12-19(20)23-21-15-7-3-5-9-17(15)22-18-10-6-4-8-16(18)21/h3-13,24H,1-2H3,(H,22,23)
    Synonyms
    Acridinyl Anisidide | EN300-7481264 | NCGC00015113-01 | 4'-(9-Acridinylamino)methanesulphon-m-anisidide | Amsidyl (TN...
  11. Gatifloxacin, Topoisomerase IV inhibitor
    CAS: 112811-59-3 EC Number: 664-293-2 Formula: C19H22FN3O4 Molecular Weight: 375.39
    Moligand™ ? Moligand™ — Aladdin's line of ligands and bioactive small molecules. Use for receptor, pathway, and binding studies needing defined small-molecule tools. ≥98%
    ● In Stock — US warehouse, ships to EU* Item #: G129827
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    IUPAC Name
    1-cyclopropyl-6-fluoro-8-methoxy-7-(3-methylpiperazin-1-yl)-4-oxoquinoline-3-carboxylic acid
    SMILES
    CC1CN(CCN1)C2=C(C=C3C(=C2OC)N(C=C(C3=O)C(=O)O)C4CC4)F
    InChIKey
    XUBOMFCQGDBHNK-UHFFFAOYSA-N
    InChI
    1S/C19H22FN3O4/c1-10-8-22(6-5-21-10)16-14(20)7-12-15(18(16)27-2)23(11-3-4-11)9-13(17(12)24)19(25)26/h7,9-11,21H,3-6,8H2,1-2H3,(H,25,26)
    Synonyms
    HMS3259P06 | AM-1155 | Spectrum3_000999 | PD-135432 | CHEBI:5280 | RKL10068 | 1-cyclopropyl-6-fluoro-8-methoxy-7-(3-m...
  12. Razoxane
    CAS: 21416-67-1 Formula: C11H16N4O4 Molecular Weight: 268.27
    Solid Moligand™ ? Moligand™ — Aladdin's line of ligands and bioactive small molecules. Use for receptor, pathway, and binding studies needing defined small-molecule tools. ≥95%
    ◐ .Made to order · 8–12 wks Item #: R168579
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    IUPAC Name
    4-[2-(3,5-dioxopiperazin-1-yl)propyl]piperazine-2,6-dione
    SMILES
    CC(CN1CC(=O)NC(=O)C1)N2CC(=O)NC(=O)C2
    InChIKey
    BMKDZUISNHGIBY-UHFFFAOYSA-N
    InChI
    1S/C11H16N4O4/c1-7(15-5-10(18)13-11(19)6-15)2-14-3-8(16)12-9(17)4-14/h7H,2-6H2,1H3,(H,12,16,17)(H,13,18,19)
    Synonyms
    AI3-52845 | Razoxana [INN-Spanish] | 2,6-Piperazinedione, 4,4'-(1-methyl-1,2-ethanediyl)bis- | (+/-)-1,2-Bis(3,5-diox...
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Frequently Asked Questions

How is the Topoisomerase listing put together?
It draws on reported Topoisomerase annotations within Cell Cycle/DNA Damage and lists each compound with its structure, identifiers, and the activity published for it. Always check the underlying assay before comparing potency values across entries.
How do I choose a Topoisomerase modulator for my assay?
Start from the assay format and readout — biochemical, cell-based, or in vivo — then compare the Topoisomerase entries on potency, selectivity over related family members, and solubility in your vehicle. Where several chemotypes are available, a reference compound plus a structurally unrelated backup is the usual way to control for off-target effects.
Which specifications matter most for Topoisomerase compounds?
Purity and identity confirmation come first, then solubility in DMSO or your chosen vehicle, recommended storage temperature, and stability in solution. For Topoisomerase work in particular, freshly prepared stocks avoid most of the reproducibility problems seen with stored plates. All products are supplied for professional research and development use only, and are not for use in humans, animals, diagnostics, or therapy.
What if the Topoisomerase compound I need is not listed?
Search by CAS number or SMILES first, since analogs of Topoisomerase compounds are often catalogued under a related target. Custom synthesis and bulk enquiries go to [email protected]. We supply verified businesses, research institutions, universities, and government agencies.

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