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Carboxylic acids and anhydrides

Tropic acid

Also known as dl-Tropic acid, 3-hydroxy-2-phenylpropanoic acid, 3-Hydroxy-2-phenylpropionic acid

CAS 552-63-6Formula C9H10O3Molar mass 166.18 g/molEC 208-465-3
GHS signal word: Warning. Pictograms: Harmful or irritant 12 suppliers listed
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Tropic acid chemical structure, C9H10O3, CAS 552-63-6
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
552-63-6
Formula
C9H10O3
Molar mass
166.18 g/mol
EC number
208-465-3
HS code
291819
Category
Carboxylic acids and anhydrides

What is Tropic acid?

Plain description, key identifiers and synonyms

Tropic acid is a 3-hydroxy monocarboxylic acid that is propionic acid in which one of the hydrogens at position 2 is substituted by a phenyl group, and one of the methyl hydrogens is substituted by a hydroxy group. It has a role as a human xenobiotic metabolite. It is functionally related to a propionic acid and a hydratropic acid. It is a conjugate acid of a tropate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
3-hydroxy-2-phenylpropanoic acid
CAS number
552-63-6 CAS number cross-checkedOther or deprecated CAS: 28845-94-5, 529-64-6
EC numbers
208-465-3, 209-020-6
Molecular formula
C9H10O3
UNII
9RM4U80765
MDL number
MFCD00004255
InChIKey
JACRWUWPXAESPB-UHFFFAOYSA-N
InChI
InChI=1S/C9H10O3/c10-6-8(9(11)12)7-4-2-1-3-5-7/h1-5,8,10H,6H2,(H,11,12)
SMILES (canonical and isomeric)
C1=CC=C(C=C1)C(CO)C(=O)O

Synonyms

  • dl-Tropic acid
  • 3-hydroxy-2-phenylpropanoic acid
  • 3-Hydroxy-2-phenylpropionic acid
  • 2-Phenylhydracrylic acid
  • alpha-(Hydroxymethyl)benzeneacetic acid
  • (+-)-tropic acid
  • Hydracrylic acid, 2-phenyl-
  • beta-hydroxyhydratropic acid
  • alpha-(Hydroxymethyl)phenylacetic acid
  • Hydratropic acid, beta-hydroxy-
  • (+/-)-Tropic acid
  • 3-hydroxy-2-phenyl-propanoic acid
  • 2-Phenylhydroacrylic acid
  • Tropicacid
  • alpha-Phenyl-beta-hydroxypropionic acid
  • alpha-Toluic acid, alpha-(hydroxymethyl)-
  • Benzeneacetic acid, alpha-(hydroxymethyl)-
  • a-Phenyl-b-hydroxypropionic acid
  • (1)-(Hydroxymethyl)phenylacetic acid
  • (+/-)-2-Phenyl-3-hydroxypropionic acid
  • 2-phenylhydracrylate
  • (2RS)-3-Hydroxy-2-phenylpropanoic Acid (Tropic Acid)
  • tropasaure
  • di-Tropic acid
  • 3-Hydroxy-2-phenylpropanoicacid
Show all 36 synonyms
  • 2-phenyl-3-hydroxypropanoic acid
  • Racemic tropic acid
  • Hyoscine Butylbromide EP Impurity B
  • b-Hydroxyhydratropate
  • Tropic acid, 98%
  • (+-)-Tropate
  • 2-Phenyl-3-hydroxypropionic acid
  • beta-Hydroxyhydratropate
  • Tropic acid (Standard)
  • b-Hydroxyhydratropic acid
  • Tropic acid, (R)-isomer

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
166.18 g/molcalc.
Exact mass
166.063 Dacalc.
LogP (octanol/water)
0.85calc.
Topological polar surface area
57.53 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
3calc.
Heavy atoms
12calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.22calc.
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, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 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

Tropic acid suppliers

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

All 12 suppliers
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Where suppliers are based

12 suppliers in 5 countries

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Tropic acid 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

  • animal metabolite
  • eukaryotic metabolite
  • human metabolite
  • human xenobiotic metabolite
  • mammalian metabolite
  • metabolite
  • xenobiotic metabolite

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Inactive 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 Tropic acid is traded under.

HS 2918.19Indicative HS code

Carboxylic acids with alcohol function but without other oxygen function, their…

World exports in 2024
$1.37B
+0.5% vs 2023, imports $1.18B
2019 to 2024
Top exporters
  1. China23.7%
  2. Italy14.7%
  3. India * partner reported12.0%
Top importers
  1. Germany11.7%
  2. South Korea9.8%
  3. Italy9.6%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Tropic acid, based on the data on this page

What is Tropic acid?

Tropic acid is a 3-hydroxy monocarboxylic acid that is propionic acid in which one of the hydrogens at position 2 is substituted by a phenyl group, and one of the methyl hydrogens is substituted by a hydroxy group. It has a role as a human xenobiotic metabolite.

What is the CAS number of Tropic acid?

The CAS registry number of Tropic acid is 552-63-6. Other or deprecated CAS numbers: 28845-94-5, 529-64-6.

What is the molecular formula and weight of Tropic acid?

The molecular formula of Tropic acid is C9H10O3 and its molar mass is 166.18 g/mol.

What is Tropic acid used for?

Known uses and roles of Tropic acid include building blocks in research and laboratory, screening compounds in research and laboratory, animal metabolite, eukaryotic metabolite, human metabolite and 4 more.

Is Tropic acid hazardous?

Tropic acid 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 Tropic acid?

Tropic acid is usually classified under HS code 291819 (Carboxylic acids with alcohol function but without other oxygen function, their…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Tropic acid?

CompoundList lists 12 suppliers of Tropic acid in China, India, United States, Czech Republic and 1 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Tropic acid in India?

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

What is the price of Tropic acid?

Suppliers quote Tropic acid 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 Tropic acid

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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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