The CAS Registry Mumber 26983-13-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,6,9,8 and 3 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 26983-13: (7*2)+(6*6)+(5*9)+(4*8)+(3*3)+(2*1)+(1*3)=141 141 % 10 = 1 So 26983-13-1 is a valid CAS Registry Number.
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