The CAS Registry Mumber 72879-11-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,2,8,7 and 9 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 72879-11: (7*7)+(6*2)+(5*8)+(4*7)+(3*9)+(2*1)+(1*1)=159 159 % 10 = 9 So 72879-11-9 is a valid CAS Registry Number.
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