The CAS Registry Mumber 168564-50-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,8,5,6 and 4 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 168564-50: (8*1)+(7*6)+(6*8)+(5*5)+(4*6)+(3*4)+(2*5)+(1*0)=169 169 % 10 = 9 So 168564-50-9 is a valid CAS Registry Number.
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