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D-Cysteine hydrochloride monohydrate

Also known as: H-D-Cys-OH.H2O.HCl, D-Cysteine hydrochloride, D-Cys hydrochloride, D-Cys-OH hydrochloride, D-Cystein, D-CYS.HCL.H2O, D-CYSTEINE HCL, D-CYSTEINE HYDROCHLORIDE 1-HYDRATE, D-Cysteine Hydrochloride Monohtydrate, D-cysteine HCL monohydrate, D-cysteine hydrochloride anhydrous, MFCD00012632, EINECS 251-043-9

D-Cysteine hydrochloride monohydrate (CAS 32443-99-5) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C3H8ClNO2S and a molecular weight of 157.619 g/mol. Key properties include a melting point of ~185 °C (dec.), a boiling point of 293.9ºC at 760 mmHg and a flash point of 131.5ºC. 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.
32443-99-5
Jingsj CID
J-1113608-6
Molecular Formula
C3H8ClNO2S
Molecular Weight
157.619 g/mol
Category
Organic Acids
Last updated
8/21/2026
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Physicochemical Properties

Melting Point~185 °C (dec.)
Boiling Point293.9ºC at 760 mmHg
Flash Point131.5ºC
Exact Mass156.996429
PSA102.12000
LogP0.83040

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]. Luckose F, et al. Effects of amino acid derivatives on physical, mental, and physiological activities. Crit Rev Food Sci Nutr. 2015;55(13):1793-807.

Customs & Trade Information

HS Code2930909090
Summary2930909090. other organo-sulphur compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of D-Cysteine hydrochloride monohydrate?

The CAS number of D-Cysteine hydrochloride monohydrate is 32443-99-5.

What are the molecular formula and molecular weight of D-Cysteine hydrochloride monohydrate?

D-Cysteine hydrochloride monohydrate has molecular formula C3H8ClNO2S and molecular weight 157.619 g/mol.

Is D-Cysteine hydrochloride monohydrate hazardous?

D-Cysteine hydrochloride monohydrate has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.

What are the upstream and downstream products of D-Cysteine hydrochloride monohydrate?

For D-Cysteine hydrochloride monohydrate, Downstream Products: S-Allyl-D-cysteine, D-Luciferin, S-Methyl-D-cysteine.

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

Last updated:

How to cite: Jingsj. "D-Cysteine hydrochloride monohydrate (CAS 32443-99-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1113608-6 (accessed 2026-11-09).

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