The CAS Registry Mumber 62676-22-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,2,6,7 and 6 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 62676-22: (7*6)+(6*2)+(5*6)+(4*7)+(3*6)+(2*2)+(1*2)=136 136 % 10 = 6 So 62676-22-6 is a valid CAS Registry Number.