The CAS Registry Mumber 66004-58-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,0,0 and 4 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 66004-58: (7*6)+(6*6)+(5*0)+(4*0)+(3*4)+(2*5)+(1*8)=108 108 % 10 = 8 So 66004-58-8 is a valid CAS Registry Number.
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