The CAS Registry Mumber 129885-21-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,8,8 and 5 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 129885-21: (8*1)+(7*2)+(6*9)+(5*8)+(4*8)+(3*5)+(2*2)+(1*1)=168 168 % 10 = 8 So 129885-21-8 is a valid CAS Registry Number.
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