The CAS Registry Mumber 389123-45-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,8,9,1,2 and 3 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 389123-45: (8*3)+(7*8)+(6*9)+(5*1)+(4*2)+(3*3)+(2*4)+(1*5)=169 169 % 10 = 9 So 389123-45-9 is a valid CAS Registry Number.
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