Chemistry, like all the natural sciences, begins with the direct observation of nature— in this case, of matter.52-90-4, Name is L-Cysteine, SMILES is N[C@@H](CS)C(O)=O, belongs to amides-buliding-blocks compound. In a document, author is Song, Liangliang, introduce the new discover, Name: L-Cysteine.
Twenty compounds, including a new lignan amide, were isolated from the aerial parts of New Zealand spinach, Tetragonia tetragonoides (Pall.) Kuntze, which is an edible halophyte. These compounds were identified by mass spectrometry and nuclear magnetic resonance experiments to be N-2,3-dihydroxy-3-(3,4-dihydroxyphenol)tyramine (new compound), methyl 4-hydroxybenzoate, syringaldehyde, ethyl 4-hydroxybenzoate, 3,4-dihydroxybenzoic acid, 2,3-dihydroxybenzoic acid, coniferyl alcohol, methyl caffeoate, trans- and cis-coumaroyl-beta-d-glucopyranosides, trans- and cis-feruloyl-beta-d-glucopyranosides, caffeic acid, staphylionoside E, canabiside D, apocyanol A, megastima-5,7-diene-3,4,9-triol, 1-O-oleoyl-3-O-beta-d-galactopyranosyl-sn-glycerol, 5,5 ‘-dimethyl-lariciresinol, and kaempferol 3-O-beta-d-glucopyranoside. These compounds were identified in New Zealand spinach for the first time.
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 52-90-4 is helpful to your research. Name: L-Cysteine.
Reference:
Amide – Wikipedia,
,Amide – an overview | ScienceDirect Topics