The CAS Registry Mumber 12772-06-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,7,7 and 2 respectively; the second part has 2 digits, 0 and 6 respectively. Calculate Digit Verification of CAS Registry Number 12772-06: (7*1)+(6*2)+(5*7)+(4*7)+(3*2)+(2*0)+(1*6)=94 94 % 10 = 4 So 12772-06-4 is a valid CAS Registry Number.