The CAS Registry Mumber 26913-45-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,6,9,1 and 3 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 26913-45: (7*2)+(6*6)+(5*9)+(4*1)+(3*3)+(2*4)+(1*5)=121 121 % 10 = 1 So 26913-45-1 is a valid CAS Registry Number.
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