The CAS Registry Mumber 86547-18-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,6,5,4 and 7 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 86547-18: (7*8)+(6*6)+(5*5)+(4*4)+(3*7)+(2*1)+(1*8)=164 164 % 10 = 4 So 86547-18-4 is a valid CAS Registry Number.
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