The CAS Registry Mumber 1266681-12-2 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,6,6,6,8 and 1 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1266681-12: (9*1)+(8*2)+(7*6)+(6*6)+(5*6)+(4*8)+(3*1)+(2*1)+(1*2)=172 172 % 10 = 2 So 1266681-12-2 is a valid CAS Registry Number.
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