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Thiazole Orange

Also known as: 1-Methyl-4-[(3-methyl-2(3H)-benzothiazolylidene)methyl]quinolinium p-tosylate, Thiazol Orange, Thiazole Orange (90%), Thiazole orange *CAS 107091-89-4*, THIAZOLE ORANGE, FOR FLUORESCENCE, (Z)-1-Methyl-4-((3-methylbenzo[d]thiazol-2(3H)-ylidene)methyl)quinolin-1-ium 4-methylbenzenesulfonate, Quinolinium, 1-methyl-4-((3-methyl-2(3H)-benzothiazolylidene)methyl)-, salt with 4-methylbenzenesulfonic acid (1:1), 4-methylbenzenesulfonate,(2Z)-3-methyl-2-[(1-methylquinolin-1-ium-4-yl)methylidene]-1,3-benzothiazole, MFCD00192499

Thiazole Orange (CAS 107091-89-4) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C26H24N2O3S2 and a molecular weight of 476.610 g/mol. Key property: a melting point of 270ºC (dec.)(lit.). It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
107091-89-4
Jingsj CID
J-49402-9
Molecular Formula
C26H24N2O3S2
Molecular Weight
476.610 g/mol
Category
Pharma Intermediates
Last updated
8/21/2026
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Physicochemical Properties

Melting Point270ºC (dec.)(lit.)
Exact Mass476.122833
PSA102.63000
LogP5.30730

GHS Safety & Compliance

IrritantSignal word: Warning
  • H315 — Causes skin irritation
  • H319 — Causes serious eye irritation
  • H335 — May cause respiratory irritation

Activity & Biological Data

Additional Information[1]. Linda G. Le, et al. Thiazole Orange: A New Dye for Reticulocyte Analysis. cytometry 7:508-517 (1986)

Frequently Asked Questions

What is the CAS number of Thiazole Orange?

The CAS number of Thiazole Orange is 107091-89-4.

What are the molecular formula and molecular weight of Thiazole Orange?

Thiazole Orange has molecular formula C26H24N2O3S2 and molecular weight 476.610 g/mol.

Is Thiazole Orange hazardous?

Thiazole Orange has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "Thiazole Orange (CAS 107091-89-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-49402-9 (accessed 2026-11-07).

Data for reference only; verify product details with suppliers before purchase.