YISHENG MAOLIAN — SOURCING BRIEF
L-Cysteine

SOURCE-LISTING SUMMARY, NOT A COA, TDS, APPROVAL OR BINDING QUOTATION.
Review status: technical and business confirmation pending.
Website: https://ymingredients.com/products/l-cysteine/
Source checked: 2026-10-24

MATERIAL-REVIEW REFERENCES
Specification wording: 99% purity
Source CAS wording: 52-90-4
CAS entries need their relationship to the complete offered material confirmed; they do not establish the identity of an extract or carrier system.
Source constituent wording: L-Cysteine; a listing term is not an analyte definition or assay result.
Source form wording: Powder

LISTED TECHNICAL FIELDS
Source labels are retained for review. An ingredient label is not an approved analyte definition; a method label is not a complete analytical protocol.
Type: Amino acid
Shelf-Life: 24months
Dosage Form: Powder
Main Ingredient: L-Cysteine
Place of Origin: Shaanxi, China
Product Specification: 99%
Storage Method: Cool & dry place.
Specification: 99% purity
Appearance: White crystalline powder
CAS No: 52-90-4
Molecular formula: C3H7NO2S
EINECS: 200-158-2
Sample: 10-20g — source listing only; availability, quantity, cost and delivery require confirmation.
Shelf life: 2 Years

SUPPLIER DETAIL TABLE — CHECKED 2026-10-25; NOT A LOT RESULT
CAS No.: 52-90-4
Appearance: White crystalline powder
Specification: 99% purity

OPEN QUESTIONS
Request the current written specification and confirm its relationship to the offered lot.

DOCUMENT REQUEST (AVAILABILITY NOT ASSUMED)
Current specification and complete composition
Representative COA and analytical methods, with lot relationship
Relevant safety and application records for the intended use

SOURCE-LISTING COMMERCIAL REFERENCES
These listing references are not an approved current offer. Confirm the actual quantity, unit, packaging and delivery terms in writing.
Source-listed MOQ: 1 kilograms
Delivery schedule: request confirmation for the selected grade, quantity, documents and destination.

YOUR COMMERCIAL BRIEF
Target grade / method: __________________
Intended application / destination: __________________
Sample or purchase quantity and unit: __________________
Packaging / delivery deadline: __________________

SOURCE LISTINGS
https://www.alibaba.com/product-detail/China-Amino-Acid-Factory-Stock-CAS_1600368870141.html

CONTACT
Xi'an Yisheng Maolian E-Commerce Co.,Ltd
西安翊昇贸联电商有限公司
Room 1403, T162, Tower A, Huixin Center, No. 1 Zhangba 1st Road, High-tech Zone, Xi'an, Shaanxi, China
陕西省西安市高新区丈八一路1号汇鑫中心-A座1403室T162
sales@ymingredients.com
+86 18135720426

Representative images do not establish identity, composition, purity or actual batch appearance.