The CAS Registry Mumber 164323-12-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,4,3,2 and 3 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 164323-12: (8*1)+(7*6)+(6*4)+(5*3)+(4*2)+(3*3)+(2*1)+(1*2)=110 110 % 10 = 0 So 164323-12-0 is a valid CAS Registry Number.
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