The CAS Registry Mumber 66547-13-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,5,4 and 7 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 66547-13: (7*6)+(6*6)+(5*5)+(4*4)+(3*7)+(2*1)+(1*3)=145 145 % 10 = 5 So 66547-13-5 is a valid CAS Registry Number.
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