The CAS Registry Mumber 88111-80-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,8,1,1 and 1 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 88111-80: (7*8)+(6*8)+(5*1)+(4*1)+(3*1)+(2*8)+(1*0)=132 132 % 10 = 2 So 88111-80-2 is a valid CAS Registry Number.
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