The CAS Registry Mumber 681485-27-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,8,1,4,8 and 5 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 681485-27: (8*6)+(7*8)+(6*1)+(5*4)+(4*8)+(3*5)+(2*2)+(1*7)=188 188 % 10 = 8 So 681485-27-8 is a valid CAS Registry Number.
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