The CAS Registry Mumber 166441-77-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,6,4,4 and 1 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 166441-77: (8*1)+(7*6)+(6*6)+(5*4)+(4*4)+(3*1)+(2*7)+(1*7)=146 146 % 10 = 6 So 166441-77-6 is a valid CAS Registry Number.
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