The CAS Registry Mumber 161278-17-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,1,2,7 and 8 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 161278-17: (8*1)+(7*6)+(6*1)+(5*2)+(4*7)+(3*8)+(2*1)+(1*7)=127 127 % 10 = 7 So 161278-17-7 is a valid CAS Registry Number.
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