The CAS Registry Mumber 66597-06-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,5,9 and 7 respectively; the second part has 2 digits, 0 and 6 respectively. Calculate Digit Verification of CAS Registry Number 66597-06: (7*6)+(6*6)+(5*5)+(4*9)+(3*7)+(2*0)+(1*6)=166 166 % 10 = 6 So 66597-06-6 is a valid CAS Registry Number.
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