The CAS Registry Mumber 264925-83-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,6,4,9,2 and 5 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 264925-83: (8*2)+(7*6)+(6*4)+(5*9)+(4*2)+(3*5)+(2*8)+(1*3)=169 169 % 10 = 9 So 264925-83-9 is a valid CAS Registry Number.
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