The CAS Registry Mumber 801228-39-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,0,1,2,2 and 8 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 801228-39: (8*8)+(7*0)+(6*1)+(5*2)+(4*2)+(3*8)+(2*3)+(1*9)=127 127 % 10 = 7 So 801228-39-7 is a valid CAS Registry Number.
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