The CAS Registry Mumber 86708-31-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,6,7,0 and 8 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 86708-31: (7*8)+(6*6)+(5*7)+(4*0)+(3*8)+(2*3)+(1*1)=158 158 % 10 = 8 So 86708-31-8 is a valid CAS Registry Number.
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