The CAS Registry Mumber 76519-17-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,5,1 and 9 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 76519-17: (7*7)+(6*6)+(5*5)+(4*1)+(3*9)+(2*1)+(1*7)=150 150 % 10 = 0 So 76519-17-0 is a valid CAS Registry Number.