The CAS Registry Mumber 80-76-2 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 8 and 0 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 80-76: (4*8)+(3*0)+(2*7)+(1*6)=52 52 % 10 = 2 So 80-76-2 is a valid CAS Registry Number.
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