We are offering l-methionine. name l-methionine synonyms l-2-amino-4-(methylthio)butyric acid molecular formula c5h11no2s molecular weight 149.21 cas registry number 63-68-3 einecs 200-562-9 properties melting point 276-279 c (dec.) alpha 23.25 (c=2, 6n hcl) water solubility soluble safety data safety description s24/25