"Z(OMe)-Arg(Mts)-Lys(Z)-Val-Leu-OMe" is a peptide sequence consisting of six amino acids: Z(OMe), Arg(Mts), Lys(Z), Val, and Leu, with an OMe group at the C-terminus. Z(OMe) represents a protected form of the amino acid methionine, where the sulfur atom is replaced by an oxygen atom, and the side chain is protected by a benzyl group. Arg(Mts) is a modified arginine residue with a methanethiosulfonate (Mts) group attached to the guanidinium group, which can be used for specific chemical reactions or modifications. Lys(Z) is a lysine residue with a benzyloxycarbonyl (Z) protecting group on the epsilon amino group. Val and Leu are unmodified valine and leucine residues, respectively. The OMe group at the C-terminus indicates a methoxy group, which can protect the carboxyl group or serve as a handle for further chemical modifications. This peptide sequence is likely used in research settings for studying protein-protein interactions, drug design, or as a building block for larger peptide or protein structures.
The CAS Registry Mumber 90709-78-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,7,0 and 9 respectively; the second part has 2 digits, 7 and 8 respectively. Calculate Digit Verification of CAS Registry Number 90709-78: (7*9)+(6*0)+(5*7)+(4*0)+(3*9)+(2*7)+(1*8)=147 147 % 10 = 7 So 90709-78-7 is a valid CAS Registry Number.