"Z-Arg(Tos)-Asp-(OBut)-Ser(But)-Ala-OH" is a peptide compound consisting of six amino acids: Z-Arginine (Tos), Aspartic acid, tert-Butyloxycarbonyl-protected Serine, tert-Butyl-protected Alanine, and a hydroxyl group at the C-terminus. The "Z" group is a protecting group for the N-terminus, which is commonly used in peptide synthesis to prevent unwanted side reactions. The "Tos" group is a tosyl protecting group for the side chain of arginine, which is used to prevent unwanted reactions at the guanidino group. The "OBut" and "But" groups are tert-butyl protecting groups for the hydroxyl groups of serine, which are used to prevent unwanted side reactions during peptide synthesis. This peptide is a synthetic compound that can be used in various biological and chemical applications, such as studying protein-protein interactions or as a building block for larger peptide or protein structures.
The CAS Registry Mumber 83077-91-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,3,0,7 and 7 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 83077-91: (7*8)+(6*3)+(5*0)+(4*7)+(3*7)+(2*9)+(1*1)=142 142 % 10 = 2 So 83077-91-2 is a valid CAS Registry Number.