The CAS Registry Mumber 214626-71-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,4,6,2 and 6 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 214626-71: (8*2)+(7*1)+(6*4)+(5*6)+(4*2)+(3*6)+(2*7)+(1*1)=118 118 % 10 = 8 So 214626-71-8 is a valid CAS Registry Number.