The CAS Registry Mumber 109922-58-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,9,2 and 2 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 109922-58: (8*1)+(7*0)+(6*9)+(5*9)+(4*2)+(3*2)+(2*5)+(1*8)=139 139 % 10 = 9 So 109922-58-9 is a valid CAS Registry Number.
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