Cystine, also known as L-cystine, 3,3'-dithiodiphenylalanine, etc., CAS No. 56-89-3, the chemical formula is C₆H2NNOO2S. It was discovered  by Wollaston from bladder stones in 1810. In 1832, Berzelius named it cystine. It is a sulfur-containing amino acids. there are a small amount of cystine in protein, mostly in the hair, fingers and other keratin. It can also be obtained by synthetic method. It is used for medicine, food, cosmetics and other industries.

    English name: L-Cystine

    Synonyms:1-cystine; 3,3'-dithiobis (2-amino-, (r- (r *, r *)) - 3,3'-dithiobis (2-aminopropanoicacid) 3,3'-Dithiobis (2-aminopropanoicacid); 3,3'-dithiobis-l-alanin; 3,3'-Dithiobis (2-aminopropanoicacid) , 3,3'-dithiobis-

     Molecular weight: 240.3

     EINECS number: 200-296-3

Related category: amino acids and their derivatives; L-Amino Acids;western medicine and API;food and feed additive; biochemical reagents; biochemicals; amino acids; neutral amino acids; amino acids; nutrition enhancers (nutritional supplement; amino acid additives; feed additives).