Tyr-c[D-Lys-Phe-Asp]NH2, also known as Tyr-D-Lys-Phe-Asp-NH2, is a synthetic peptide consisting of five amino acids: tyrosine, D-lysine, phenylalanine, aspartic acid, and a terminal amide group. This peptide is a cyclic structure, indicated by the square brackets, which means the first and last amino acids are connected to form a ring. It is often used in pharmaceutical research due to its potential as an antagonist of certain receptors, such as the melanocortin receptors, which are involved in various physiological processes including pigmentation and energy homeostasis. The D-lysine in the sequence indicates that the lysine amino acid is in its D-configuration, which is the mirror image of the naturally occurring L-configuration and can affect the peptide's biological activity. This specific sequence and structure make Tyr-c[D-Lys-Phe-Asp]NH2 a subject of interest in the development of drugs targeting melanocortin receptor-related disorders.
The CAS Registry Mumber 95610-94-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,6,1 and 0 respectively; the second part has 2 digits, 9 and 4 respectively. Calculate Digit Verification of CAS Registry Number 95610-94: (7*9)+(6*5)+(5*6)+(4*1)+(3*0)+(2*9)+(1*4)=149 149 % 10 = 9 So 95610-94-9 is a valid CAS Registry Number.