The CAS Registry Mumber 80127-70-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,0,1,2 and 7 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 80127-70: (7*8)+(6*0)+(5*1)+(4*2)+(3*7)+(2*7)+(1*0)=104 104 % 10 = 4 So 80127-70-4 is a valid CAS Registry Number.
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