The CAS Registry Mumber 82080-56-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,0,8 and 0 respectively; the second part has 2 digits, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 82080-56: (7*8)+(6*2)+(5*0)+(4*8)+(3*0)+(2*5)+(1*6)=116 116 % 10 = 6 So 82080-56-6 is a valid CAS Registry Number.
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