The CAS Registry Mumber 2891-59-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,8,9 and 1 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 2891-59: (6*2)+(5*8)+(4*9)+(3*1)+(2*5)+(1*9)=110 110 % 10 = 0 So 2891-59-0 is a valid CAS Registry Number.
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