The CAS Registry Mumber 681477-84-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,8,1,4,7 and 7 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 681477-84: (8*6)+(7*8)+(6*1)+(5*4)+(4*7)+(3*7)+(2*8)+(1*4)=199 199 % 10 = 9 So 681477-84-9 is a valid CAS Registry Number.
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