The CAS Registry Mumber 93799-61-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,7,9 and 9 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 93799-61: (7*9)+(6*3)+(5*7)+(4*9)+(3*9)+(2*6)+(1*1)=192 192 % 10 = 2 So 93799-61-2 is a valid CAS Registry Number.