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Resazurin

Athanor · official

C12H7NO4 · 229.19 g/mol

IUPAC name: 7-hydroxy-10-oxidophenoxazin-10-ium-3-one

Also called alamarBlue, viability dye, diazoresorcinol

ReagentsRings
Open in Athanor
The structure of Resazurin
Drawn from its SMILES with RDKit
Harmful or irritantWarningCauses skin irritation · Causes serious eye irritation · May cause respiratory irritation

Names and identifiers

IUPAC name
7-hydroxy-10-oxidophenoxazin-10-ium-3-one
Synonyms
alamarBlue, viability dye, diazoresorcinol
+ 37 more

Diazoresorcinol, Azoresorcin, Resazoin, Resazurine, 7-Hydroxy-3H-phenoxazin-3-one 10-oxide, 3H-Phenoxazin-3-one, 7-hydroxy-, 10-oxide, RHODALUX, DTXSID4060280, 1FN9YD6968, NSC-10438, NSC-56323, 7-hydroxy-10-oxido-phenoxazin-10-ium-3-one, reazurin, reazurine, Alamarblue, RefChem:178890, DTXCID3041823, 208-987-1, Alamar blue, 7-Hydroxy-3-oxo-3H-phenoxazine 10-oxide, 7-hydroxy-10-oxidophenoxazin-10-ium-3-one, 3H-Phenoxazin-3-one, 10-oxide, WLN: T C666 BN FV IOJ BO LQ, EINECS 208-987-1, NSC 10438, BRN 0221382, UNII-1FN9YD6968, 3H-Phenoxazin-3-one,7-hydroxy-, 10-oxide, 7-Hydroxy-3H-fenoxazin-3-on-10-oxid [Czech], PLXBWHJQWKZRKG-UHFFFAOYSA-N, MFCD00066739, 7-Hydroxy-3H-fenoxazin-3-on-10-oxid, RESAZURIN [MI], MolMap_000044, SCHEMBL6338, 7-hydroxy-3-oxo-3H-phenoxazin-10-ium-10-olate, 4-27-00-03594 (Beilstein Handbook Reference)

Molecular formula
C12H7NO4
Empirical formula
C12H7NO4
Molecular weight
229.19 g/mol
Exact mass
229.03751
CAS number
62758-13-8
PubChem CID
11077
Canonical SMILES
C1=CC2=C(C=C1O)OC3=CC(=O)C=CC3=[N+]2[O-]
Isomeric SMILES
C1=CC2=C(C=C1O)OC3=CC(=O)C=CC3=[N+]2[O-]
InChI
InChI=1S/C12H7NO4/c14-7-1-3-9-11(5-7)17-12-6-8(15)2-4-10(12)13(9)16/h1-6,14H
InChIKey
PLXBWHJQWKZRKG-UHFFFAOYSA-N
Molfile

Names, InChI and the identifiers from PubChem, retrieved 2026-10-14.

Calculated

Heavy atoms
17
Rings
3
Aromatic rings
1
Fraction sp³ carbons (Fsp3)
0
H-bond donors
1
H-bond acceptors
4
Rotatable bonds
0
TPSA (Ų)
77.4 computed here · PubChem 75.3
Formal charge
0
XLogP3
-0.1 PubChem
Complexity
463 PubChem
Stereocenters
None
Double-bond geometry
None specified
Point group
Cs of one 3D conformer with its hydrogens, by Athanor’s engine (as in the app)

Elemental analysis

  • C62.89%
  • H3.08%
  • N6.11%
  • O27.92%

Isotope pattern

100%229.03714%230.0411.7%231.043232.045

Each peak is a nominal mass with its abundance-weighted exact mass, as a percentage of the tallest, from IUPAC natural isotope abundances.

Computed from the structure with RDKit 2026.09 when this page was built, beside PubChem's own computed values from its record; where the two differ, both are shown.

Predicted

log P
1.24 Crippen (Wildman and Crippen 1999)
log S (water solubility)
-2.65 ESOL (Delaney 2004), log mol/L
Synthetic accessibility
3.08 SA score, 1 easy to 10 hard (Ertl and Schuffenhauer 2009)

Drug-likeness: Lipinski’s rule of five

  • Molecular weight ≤ 500: 229.19
  • log P ≤ 5 (Crippen): 1.24
  • H-bond donors ≤ 5: 1
  • H-bond acceptors ≤ 10: 4

Passes all four rules.

¹³C NMR shifts, predicted

Predictions, not measurements; each names its method. A measured log P, where a source reports one, is under Physical properties.

Safety

Warning

Most widely reported: 41 company reports to ECHA. Source [1].

  • Harmful or irritant
  • H315Causes skin irritation (92.7% of reports)
  • H319Causes serious eye irritation (92.7% of reports)
  • H335May cause respiratory irritation (92.7% of reports)

Precautionary statements: P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501

View all classifications (2)
  • [1] European Chemicals Agency (ECHA)This chemical does not meet GHS hazard criteria for 7.3% (3 of 41) of reports.
  • [1] European Chemicals Agency (ECHA) · 41 reports · WarningH315, H319, H335

Safety data sheets on the supplier’s page: AbaChemScene, Smolecule, Biosynth.

Always read the supplier’s safety data sheet before working with it.

Spectra

Experimental spectra held by these sources; each link opens the source's own record.

Literature

Reading PubChem, OpenAlex and GSRS…

Bioactivity

Reading ChEMBL…

References

  1. [1]European Chemicals Agency (ECHA) · ECHA legal notice: reuse with acknowledgement · via PubChem · retrieved 2026-10-14
  2. [2]SpectraBase · Linked only · via PubChem · retrieved 2026-10-14
  3. ·Calculated values: computed by Athanor with RDKit 2026.09 from the structure.
  4. ·Literature on PubChem

Data last updated 2026-10-14.