The CAS Registry Mumber 16218-61-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,2,1 and 8 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 16218-61: (7*1)+(6*6)+(5*2)+(4*1)+(3*8)+(2*6)+(1*1)=94 94 % 10 = 4 So 16218-61-4 is a valid CAS Registry Number.
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