The CAS Registry Mumber 85232-11-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,2,3 and 2 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 85232-11: (7*8)+(6*5)+(5*2)+(4*3)+(3*2)+(2*1)+(1*1)=117 117 % 10 = 7 So 85232-11-7 is a valid CAS Registry Number.