The CAS Registry Mumber 871316-26-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,7,1,3,1 and 6 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 871316-26: (8*8)+(7*7)+(6*1)+(5*3)+(4*1)+(3*6)+(2*2)+(1*6)=166 166 % 10 = 6 So 871316-26-6 is a valid CAS Registry Number.
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