The CAS Registry Mumber 211294-76-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,1,2,9 and 4 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 211294-76: (8*2)+(7*1)+(6*1)+(5*2)+(4*9)+(3*4)+(2*7)+(1*6)=107 107 % 10 = 7 So 211294-76-7 is a valid CAS Registry Number.