The CAS Registry Mumber 15919-97-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,5,9,1 and 9 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 15919-97: (7*1)+(6*5)+(5*9)+(4*1)+(3*9)+(2*9)+(1*7)=138 138 % 10 = 8 So 15919-97-8 is a valid CAS Registry Number.
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