The CAS Registry Mumber 816-59-1 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 8,1 and 6 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 816-59: (5*8)+(4*1)+(3*6)+(2*5)+(1*9)=81 81 % 10 = 1 So 816-59-1 is a valid CAS Registry Number.
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