The CAS Registry Mumber 74607-12-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,6,0 and 7 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 74607-12: (7*7)+(6*4)+(5*6)+(4*0)+(3*7)+(2*1)+(1*2)=128 128 % 10 = 8 So 74607-12-8 is a valid CAS Registry Number.