The CAS Registry Mumber 494868-08-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,9,4,8,6 and 8 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 494868-08: (8*4)+(7*9)+(6*4)+(5*8)+(4*6)+(3*8)+(2*0)+(1*8)=215 215 % 10 = 5 So 494868-08-5 is a valid CAS Registry Number.