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Basic and cationic dyes

C.I. Basic Orange 21

Also known as Astrazon Orange G, Basic Orange 21, Astrazon Orange

CAS 3056-93-7Formula C22H23ClN2Molar mass 350.89 g/molEC 221-290-7
GHS signal word: Warning. Pictograms: Harmful or irritant 3 suppliers listed
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C.I. Basic Orange 21 chemical structure, C22H23ClN2, CAS 3056-93-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
3056-93-7
Formula
C22H23ClN2
Molar mass
350.89 g/mol
EC number
221-290-7
HS code
320413
Category
Basic and cationic dyes

What is C.I. Basic Orange 21?

Plain description, key identifiers and synonyms

C.I. Basic Orange 21 is a chemical substance with the molecular formula C22H23ClN2 and a molar mass of 350.89 g/mol. Its CAS registry number is 3056-93-7. The IUPAC name is 1,3,3-trimethyl-2-[(E)-2-(2-methyl-1H-indol-3-yl)ethenyl]indol-1-ium chloride.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1,3,3-trimethyl-2-[(E)-2-(2-methyl-1H-indol-3-yl)ethenyl]indol-1-ium chloride
CAS number
3056-93-7 CAS number cross-checked
EC number
221-290-7
Molecular formula
C22H23ClN2
InChIKey
ZOMLUNRKXJYKPD-UHFFFAOYSA-N
InChI
InChI=1S/C22H22N2.ClH/c1-15-16(17-9-5-7-11-19(17)23-15)13-14-21-22(2,3)18-10-6-8-12-20(18)24(21)4;/h5-14H,1-4H3;1H
Canonical SMILES
Cc1[nH]c2ccccc2c1C=CC1=[N+](C)c2ccccc2C1(C)C.[Cl-]
Isomeric SMILES
CC1=C(C2=CC=CC=C2N1)/C=C/C3=[N+](C4=CC=CC=C4C3(C)C)C.[Cl-]

Synonyms

  • Astrazon Orange G
  • Basic Orange 21
  • Astrazon Orange
  • Sevron Orange G
  • Nabor Orange G
  • Orange ZH
  • Genacryl Orange G
  • Sumiacryl Orange G
  • Cationic Orange ZH
  • Sandocryl Orange B-G
  • Aizen Cathilon Orange GL
  • Aizen Cathilon Orange GLH
  • C.I. 48035
  • 1,3,3-trimethyl-2-[(E)-2-(2-methyl-1H-indol-3-yl)ethenyl]indol-1-ium, chloride
  • 1H-Indole, 2,3-dihydro-1,3,3-trimethyl-2-((2-methyl-3H-indol-3-ylidene)ethylidene)-, monohydrochloride
  • (E)-1,3,3-trimethyl-2-(2-(2-methyl-1H-indol-3-yl)vinyl)-3H-indol-1-ium chloride
  • 3H-Indolium, 2-(2-(2-methylindol-3-yl)vinyl)-1,3,3-trimethyl-, chloride
  • 1H-Indole, 2,3-dihydro-1,3,3-trimethyl-2-(2-(2-methyl-3H-indol-3-ylidene)ethylidene)-, hydrochloride (1:1)
  • 1H-Indole, 2,3-dihydro-1,3,3-trimethyl-2-[2-(2-methyl-3H-indol-3-ylidene)ethylidene]-, hydrochloride (1:1)
  • 1,3,3-Trimethyl-2-(2-(2-methyl-3-indolyl)vinyl)indolium chloride
  • 1,3,3-trimethyl-2-[(1E)-2-(2-methyl-1H-indol-3-yl)ethenyl]indol-1-ium chloride
  • 1,3,3-Trimethyl-2-((2-methyl-3H-indol-3-ylidene)ethylidene)indoline monohydrochloride
  • Basic orange 21 (genacryl orange g)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
350.89 g/molcalc.
Exact mass
350.155 Dacalc.
LogP (octanol/water)
2.2calc.
Topological polar surface area
18.8 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
2calc.
Heavy atoms
25calc.
Rings
4calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.23calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, C(=Cc1c[nH]c2ccccc12)C1=Nc2ccccc2C1

C(=Cc1c[nH]c2ccccc12)C1=Nc2ccccc2C1

4 rings, 20 atoms.

8 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H312Harmful in contact with skin.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H332Harmful if inhaled.
  • H335May cause respiratory irritation.
Precautionary statements (17)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P317Get medical help.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

C.I. Basic Orange 21 suppliers

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All 3 suppliers

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Where suppliers are based

3 suppliers in 1 country

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C.I. Basic Orange 21 price

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Uses and applications

What the substance is used for, by industry and function

Industries and functions

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code C.I. Basic Orange 21 is traded under.

HS 3204.13Indicative HS code

Basic dyes and preparations based thereon

World exports in 2024
$209M
−2.6% vs 2023, imports $224M
2019 to 2024
Top exporters
  1. India * partner reported27.9%
  2. China21.8%
  3. Spain6.6%
Top importers
  1. United States11.2%
  2. China7.9%
  3. Germany7.4%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for C.I. Basic Orange 21 is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about C.I. Basic Orange 21, based on the data on this page

What is C.I. Basic Orange 21?

C.I. Basic Orange 21 is a chemical substance with the molecular formula C22H23ClN2 and a molar mass of 350.89 g/mol. Its CAS registry number is 3056-93-7. The IUPAC name is 1,3,3-trimethyl-2-[(E)-2-(2-methyl-1H-indol-3-yl)ethenyl]indol-1-ium chloride.

What is the CAS number of C.I. Basic Orange 21?

The CAS registry number of C.I. Basic Orange 21 is 3056-93-7.

What is the molecular formula and weight of C.I. Basic Orange 21?

The molecular formula of C.I. Basic Orange 21 is C22H23ClN2 and its molar mass is 350.89 g/mol.

What is C.I. Basic Orange 21 used for?

Known uses and roles of C.I. Basic Orange 21 include textile dyes in textiles and leather.

Is C.I. Basic Orange 21 hazardous?

C.I. Basic Orange 21 carries the GHS signal word "Warning". Main hazards: harmful in contact with skin, causes skin irritation, causes serious eye irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of C.I. Basic Orange 21?

C.I. Basic Orange 21 is usually classified under HS code 320413 (Basic dyes and preparations based thereon). This is indicative, confirm it with your customs broker before shipping.

Where can I buy C.I. Basic Orange 21?

CompoundList lists 3 suppliers of C.I. Basic Orange 21 in China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of C.I. Basic Orange 21?

Suppliers quote C.I. Basic Orange 21 on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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