The CAS Registry Mumber 144696-57-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,4,6,9 and 6 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 144696-57: (8*1)+(7*4)+(6*4)+(5*6)+(4*9)+(3*6)+(2*5)+(1*7)=161 161 % 10 = 1 So 144696-57-1 is a valid CAS Registry Number.
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