Hoechst 33342

Also known as: Bisbenzimide H 33342, Bisbenzimide H 33342 trihydrochloride, 2'-(4-Ethoxyphenyl)-5-(4-methyl-1-piperazinyl)-2,5'-bi-1H-benzimidazole trihydrochloride, HOE 33342, Hoe 33342, bisBenzimide (ethoxyphenyl form), 2'-(4-Ethoxyphenyl)-5-(4-methylpiperazin-1-yl)-1H,1'H-2,5'-bibenzimidazole trihydrochloride

Hoechst 33342 (CAS 23491-52-3) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C27H28N6O and a molecular weight of 452.55 g/mol. Key property: a melting point of 268ºC. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 23491-52-3
Jingsj CID: J-47807-9
Molecular Formula: C₂₇H₂₈N₆O
Molecular Weight: 452.55 g/mol
Category: Organic Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	268ºC
PSA	100.76000
LogP	7.13970
Storage Conditions	2-8℃

GHS Safety & Compliance

Irritant / Health HazardSignal word: Warning

H302 — Harmful if swallowed
H315 — Causes skin irritation
H335 — May cause respiratory irritation
H341 — Suspected of causing genetic defects

Activity & Biological Data

Target	Dye reagent[1] DNA Stain[1]
Additional Information	[1]. Chazotte B. Labeling nuclear DNA with hoechst 33342. Cold Spring Harb Protoc. 2011 Jan 1;2011(1):pdb.prot5557.

Customs & Trade Information

HS Code	2933990090
Summary	2933990090. heterocyclic compounds with nitrogen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of Hoechst 33342?

The CAS number of Hoechst 33342 is 23491-52-3.

What are the molecular formula and molecular weight of Hoechst 33342?

Hoechst 33342 has molecular formula C27H28N6O and molecular weight 452.55 g/mol.

Is Hoechst 33342 hazardous?

Hoechst 33342 has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H315 — Causes skin 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: 8/21/2026

How to cite: Jingsj. "Hoechst 33342 (CAS 23491-52-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-47807-9 (accessed 2026-11-09).

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