The CAS Registry Mumber 728864-66-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,2,8,8,6 and 4 respectively; the second part has 2 digits, 6 and 6 respectively. Calculate Digit Verification of CAS Registry Number 728864-66: (8*7)+(7*2)+(6*8)+(5*8)+(4*6)+(3*4)+(2*6)+(1*6)=212 212 % 10 = 2 So 728864-66-2 is a valid CAS Registry Number.
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