The CAS Registry Mumber 951327-93-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,5,1,3,2 and 7 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 951327-93: (8*9)+(7*5)+(6*1)+(5*3)+(4*2)+(3*7)+(2*9)+(1*3)=178 178 % 10 = 8 So 951327-93-8 is a valid CAS Registry Number.