The CAS Registry Mumber 126310-28-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,6,3,1 and 0 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 126310-28: (8*1)+(7*2)+(6*6)+(5*3)+(4*1)+(3*0)+(2*2)+(1*8)=89 89 % 10 = 9 So 126310-28-9 is a valid CAS Registry Number.
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