The CAS Registry Mumber 399034-12-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,9,9,0,3 and 4 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 399034-12: (8*3)+(7*9)+(6*9)+(5*0)+(4*3)+(3*4)+(2*1)+(1*2)=169 169 % 10 = 9 So 399034-12-9 is a valid CAS Registry Number.
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