The CAS Registry Mumber 93570-32-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,5,7 and 0 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 93570-32: (7*9)+(6*3)+(5*5)+(4*7)+(3*0)+(2*3)+(1*2)=142 142 % 10 = 2 So 93570-32-2 is a valid CAS Registry Number.