The CAS Registry Mumber 151592-32-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,1,5,9 and 2 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 151592-32: (8*1)+(7*5)+(6*1)+(5*5)+(4*9)+(3*2)+(2*3)+(1*2)=124 124 % 10 = 4 So 151592-32-4 is a valid CAS Registry Number.