The CAS Registry Mumber 129593-46-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,5,9 and 3 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 129593-46: (8*1)+(7*2)+(6*9)+(5*5)+(4*9)+(3*3)+(2*4)+(1*6)=160 160 % 10 = 0 So 129593-46-0 is a valid CAS Registry Number.