The CAS Registry Mumber 181274-49-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,1,2,7 and 4 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 181274-49: (8*1)+(7*8)+(6*1)+(5*2)+(4*7)+(3*4)+(2*4)+(1*9)=137 137 % 10 = 7 So 181274-49-7 is a valid CAS Registry Number.
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