The CAS Registry Mumber 5218-85-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,2,1 and 8 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 5218-85: (6*5)+(5*2)+(4*1)+(3*8)+(2*8)+(1*5)=89 89 % 10 = 9 So 5218-85-9 is a valid CAS Registry Number.
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