The CAS Registry Mumber 64806-90-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,8,0 and 6 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 64806-90: (7*6)+(6*4)+(5*8)+(4*0)+(3*6)+(2*9)+(1*0)=142 142 % 10 = 2 So 64806-90-2 is a valid CAS Registry Number.
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