The CAS Registry Mumber 219989-87-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,9,9,8 and 9 respectively; the second part has 2 digits, 8 and 7 respectively. Calculate Digit Verification of CAS Registry Number 219989-87: (8*2)+(7*1)+(6*9)+(5*9)+(4*8)+(3*9)+(2*8)+(1*7)=204 204 % 10 = 4 So 219989-87-4 is a valid CAS Registry Number.
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