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Amino acids and derivatives

D-Tryptophan

Also known as D(+)-Tryptophan, (2R)-2-amino-3-(1H-indol-3-yl)propanoic acid, (R)-Tryptophan

CAS 153-94-6Formula C11H12N2O2Molar mass 204.23 g/molEC 205-819-9
GHS signal word: Warning. Pictograms: Harmful or irritant 38 suppliers listed
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D-Tryptophan chemical structure, C11H12N2O2, CAS 153-94-6
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Solid
Melting point
275 to 282.2
Solubility
1 to 5 mg/mL at 75 °F
HS code
293399
Category
Amino acids and derivatives
Illustrative photo, assorted laboratory chemical bottles and jars on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is D-Tryptophan?

Plain description, key identifiers and synonyms

D-tryptophan is the D-enantiomer of tryptophan. It has a role as a bacterial metabolite. It is a D-alpha-amino acid and a tryptophan. It is a conjugate base of a D-tryptophanium. It is a conjugate acid of a D-tryptophanate. It is an enantiomer of a L-tryptophan. It is a tautomer of a D-tryptophan zwitterion.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(2R)-2-amino-3-(1H-indol-3-yl)propanoic acid
CAS number
153-94-6 CAS number cross-checked
EC number
205-819-9
Molecular formula
C11H12N2O2
UNII
7NS97N9H1G
MDL number
MFCD00005647
InChIKey
QIVBCDIJIAJPQS-SECBINFHSA-N
InChI
InChI=1S/C11H12N2O2/c12-9(11(14)15)5-7-6-13-10-4-2-1-3-8(7)10/h1-4,6,9,13H,5,12H2,(H,14,15)/t9-/m1/s1
Canonical SMILES
NC(Cc1c[nH]c2ccccc12)C(=O)O
Isomeric SMILES
C1=CC=C2C(=C1)C(=CN2)C[C@H](C(=O)O)N

Synonyms

  • D(+)-Tryptophan
  • (2R)-2-amino-3-(1H-indol-3-yl)propanoic acid
  • (R)-Tryptophan
  • (+)-Tryptophan
  • D-Trytophane
  • Tryptophan, D-
  • D-(+)-Tryptophan
  • DTryptophane
  • (R)Tryptophan
  • Tryptophan, D
  • D(+)Tryptophan
  • 3,3'Indolyl2alanine
  • 2Amino3,3'indolylpropanoic acid
  • (R)alphaAmino3indolepropionic acid
  • (R)alphaAminoindole3propanoic acid
  • 3,3'-Indolyl-2-alanine
  • alphaAmino3,3'indolylpropanoic acid
  • 2-Amino-3,3'-indolylpropanoic acid
  • (R)-alpha-Amino-3-indolepropionic acid
  • (R)-alpha-Aminoindole-3-propanoic acid
  • alpha-Amino-3,3'-indolylpropanoic acid
  • (2R)-2-azaniumyl-3-(1H-indol-3-yl)propanoate
  • H-D-Trp-OH
  • D-Tryptophane
  • H-D-Typ-OH
Show all 38 synonyms
  • D-Trp
  • D-Trp-OH
  • DTR
  • (R)-(+)-2-Amino-3-(3-indolyl)propionic Acid
  • (R)-2-amino-3-(1H-indol-3-yl)propanoic acid
  • (2R)-2-amino-3-indol-3-ylpropanoic acid
  • (R)-2-Amino-3-(3-indolyl)propionic acid
  • (R)-(+)-tryptophan
  • (2R)-2-amino-3-(1H-indol-3-yl)propanoate
  • delta-trytophane
  • D-Trypophan
  • delta-tryptophane
  • DTrp

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

Physical form
Solidexp.
Melting point
275 to 282.2exp.
Solubility
1 to 5 mg/mL at 75 °Fexp.

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
204.23 g/molcalc.
Exact mass
204.0899 Dacalc.
LogP (octanol/water)
1.12calc.
Topological polar surface area
79.11 Ųcalc.
Hydrogen bond donors
3calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
3calc.
Heavy atoms
15calc.
Rings
2calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.18calc.
Formal charge
0calc.
Stereocentres
1calc.
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, c1ccc2[nH]ccc2c1

c1ccc2[nH]ccc2c1

2 rings, 9 atoms, the Indole ring system.

25,097 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

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • 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.
  • 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

D-Tryptophan suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 38 suppliers
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Where suppliers are based

38 suppliers in 4 countries

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D-Tryptophan price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Roles

  • bacterial metabolite
  • metabolite
  • prokaryotic metabolite

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 D-Tryptophan is traded under.

HS 2933.99Indicative HS code

Heterocyclic compounds with nitrogen hetero-atom(s) only, other

World exports in 2024
$12.1B
−31.0% vs 2023, imports $28.8B
2019 to 2024
Top exporters
  1. China30.5%
  2. India * partner reported16.3%
  3. Ireland9.0%
Top importers
  1. Slovenia31.7%
  2. Italy24.2%
  3. United States5.0%

* Partner reported figures, a lower bound.

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

The HS code shown for D-Tryptophan is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about D-Tryptophan, based on the data on this page

What is D-Tryptophan?

D-tryptophan is the D-enantiomer of tryptophan. It has a role as a bacterial metabolite. It is a D-alpha-amino acid and a tryptophan. It is a conjugate base of a D-tryptophanium. It is a conjugate acid of a D-tryptophanate. It is an enantiomer of a L-tryptophan. It is a tautomer of a D-tryptophan zwitterion.

What is the CAS number of D-Tryptophan?

The CAS registry number of D-Tryptophan is 153-94-6.

What is the molecular formula and weight of D-Tryptophan?

The molecular formula of D-Tryptophan is C11H12N2O2 and its molar mass is 204.23 g/mol.

What is D-Tryptophan used for?

Known uses and roles of D-Tryptophan include bacterial metabolite, metabolite and prokaryotic metabolite.

Is D-Tryptophan hazardous?

D-Tryptophan carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of D-Tryptophan?

D-Tryptophan is usually classified under HS code 293399 (Heterocyclic compounds with nitrogen hetero-atom(s) only, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy D-Tryptophan?

CompoundList lists 38 suppliers of D-Tryptophan in China, United States, India and Czech Republic. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy D-Tryptophan in India?

2 suppliers in India list D-Tryptophan on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of D-Tryptophan?

Suppliers quote D-Tryptophan 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

Practical guides that help when you source, ship or handle D-Tryptophan

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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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