The CAS Registry Mumber 82523-65-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,5,2 and 3 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 82523-65: (7*8)+(6*2)+(5*5)+(4*2)+(3*3)+(2*6)+(1*5)=127 127 % 10 = 7 So 82523-65-7 is a valid CAS Registry Number.
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