The CAS Registry Mumber 667429-66-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,7,4,2 and 9 respectively; the second part has 2 digits, 6 and 6 respectively. Calculate Digit Verification of CAS Registry Number 667429-66: (8*6)+(7*6)+(6*7)+(5*4)+(4*2)+(3*9)+(2*6)+(1*6)=205 205 % 10 = 5 So 667429-66-5 is a valid CAS Registry Number.
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