The CAS Registry Mumber 56813-69-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,6,8,1 and 3 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 56813-69: (7*5)+(6*6)+(5*8)+(4*1)+(3*3)+(2*6)+(1*9)=145 145 % 10 = 5 So 56813-69-5 is a valid CAS Registry Number.
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