The CAS Registry Mumber 106401-63-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,6,4,0 and 1 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 106401-63: (8*1)+(7*0)+(6*6)+(5*4)+(4*0)+(3*1)+(2*6)+(1*3)=82 82 % 10 = 2 So 106401-63-2 is a valid CAS Registry Number.
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