The CAS Registry Mumber 198714-90-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,8,7,1 and 4 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 198714-90: (8*1)+(7*9)+(6*8)+(5*7)+(4*1)+(3*4)+(2*9)+(1*0)=188 188 % 10 = 8 So 198714-90-8 is a valid CAS Registry Number.
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