"Z-D-Val-L-HyIv-L-Ala-D-HyIv-OtBu" is a peptide sequence consisting of several amino acids and a protecting group. The sequence starts with Z-D-Val, where Z is a benzyloxycarbonyl protecting group, D-Val is the D-isomer of valine, an amino acid. Next is L-HyIv, which stands for L-homoisoleucine, the L-isomer of a non-standard amino acid. This is followed by L-Ala, the L-isomer of alanine, another common amino acid. The sequence then repeats D-HyIv, and ends with OtBu, which is a tert-butyloxycarbonyl protecting group. This peptide is likely used in synthetic chemistry, particularly in the synthesis of larger proteins or for studying peptide interactions, due to its non-standard amino acids and protecting groups that can influence its properties and reactivity.
The CAS Registry Mumber 31508-98-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,5,0 and 8 respectively; the second part has 2 digits, 9 and 8 respectively. Calculate Digit Verification of CAS Registry Number 31508-98: (7*3)+(6*1)+(5*5)+(4*0)+(3*8)+(2*9)+(1*8)=102 102 % 10 = 2 So 31508-98-2 is a valid CAS Registry Number.