The CAS Registry Mumber 9005-22-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 9,0,0 and 5 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 9005-22: (6*9)+(5*0)+(4*0)+(3*5)+(2*2)+(1*2)=75 75 % 10 = 5 So 9005-22-5 is a valid CAS Registry Number.
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