The CAS Registry Mumber 95515-26-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,5,1 and 5 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 95515-26: (7*9)+(6*5)+(5*5)+(4*1)+(3*5)+(2*2)+(1*6)=147 147 % 10 = 7 So 95515-26-7 is a valid CAS Registry Number.