The CAS Registry Mumber 252000-22-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,2,0,0 and 0 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 252000-22: (8*2)+(7*5)+(6*2)+(5*0)+(4*0)+(3*0)+(2*2)+(1*2)=69 69 % 10 = 9 So 252000-22-9 is a valid CAS Registry Number.
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