The CAS Registry Mumber 80646-53-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,0,6,4 and 6 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 80646-53: (7*8)+(6*0)+(5*6)+(4*4)+(3*6)+(2*5)+(1*3)=133 133 % 10 = 3 So 80646-53-3 is a valid CAS Registry Number.
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