The CAS Registry Mumber 26591-53-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,6,5,9 and 1 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 26591-53: (7*2)+(6*6)+(5*5)+(4*9)+(3*1)+(2*5)+(1*3)=127 127 % 10 = 7 So 26591-53-7 is a valid CAS Registry Number.
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