The CAS Registry Mumber 166976-89-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,6,9,7 and 6 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 166976-89: (8*1)+(7*6)+(6*6)+(5*9)+(4*7)+(3*6)+(2*8)+(1*9)=202 202 % 10 = 2 So 166976-89-2 is a valid CAS Registry Number.
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