The CAS Registry Mumber 206446-63-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,6,4,4 and 6 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 206446-63: (8*2)+(7*0)+(6*6)+(5*4)+(4*4)+(3*6)+(2*6)+(1*3)=121 121 % 10 = 1 So 206446-63-1 is a valid CAS Registry Number.
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