The CAS Registry Mumber 746605-11-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,4,6,6,0 and 5 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 746605-11: (8*7)+(7*4)+(6*6)+(5*6)+(4*0)+(3*5)+(2*1)+(1*1)=168 168 % 10 = 8 So 746605-11-8 is a valid CAS Registry Number.