The CAS Registry Mumber 16597-28-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,5,9 and 7 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 16597-28: (7*1)+(6*6)+(5*5)+(4*9)+(3*7)+(2*2)+(1*8)=137 137 % 10 = 7 So 16597-28-7 is a valid CAS Registry Number.
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