**English Name:** D-Cysteine Hydrochloride Monohydrate; HD-Cys-OH·H₂O·HCl
**other Names:** D-β-Mercapto Alanine Salt
**CAS Number:** 32443-99-5
**Molecular Formula:** C₃H₇NO₂S·HCl·H₂O
**Molecular Weight:** 175.63 g/mol
**Grade:** BR (Bench Reagent)
**Purity:** ≥ 98.0%
**Appearance:** White crystalline powder or crystals
**Description:** This is the non-natural isomer of cysteine, commonly used in biochemical and analytical research. It is hygroscopic and sensitive to air exposure, so it should be stored properly.
**Solubility:** Readily soluble in water and ethanol.
**Specific Optical Rotation:** [α]₂₀ᴰ = -5° (c = 2, 5 mol/L)
**Irritant:** May cause mild irritation upon contact with skin or eyes.
**Applications:** Widely used in biochemical studies, analytical chemistry, and as a reagent in organic synthesis.
**Storage:** Store at room temperature (RT), away from light and moisture.
**Note:** Handle with care, use appropriate personal protective equipment (PPE) when working with this compound.
This product is ideal for researchers and laboratories requiring high-purity reagents for experimental purposes. Always follow safety guidelines and local regulations when handling chemical substances.
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