The CAS Registry Mumber 49614-61-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,9,6,1 and 4 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 49614-61: (7*4)+(6*9)+(5*6)+(4*1)+(3*4)+(2*6)+(1*1)=141 141 % 10 = 1 So 49614-61-1 is a valid CAS Registry Number.