The CAS Registry Mumber 16981-58-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,9,8 and 1 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 16981-58: (7*1)+(6*6)+(5*9)+(4*8)+(3*1)+(2*5)+(1*8)=141 141 % 10 = 1 So 16981-58-1 is a valid CAS Registry Number.
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