The CAS Registry Mumber 682319-83-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,8,2,3,1 and 9 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 682319-83: (8*6)+(7*8)+(6*2)+(5*3)+(4*1)+(3*9)+(2*8)+(1*3)=181 181 % 10 = 1 So 682319-83-1 is a valid CAS Registry Number.
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