The CAS Registry Mumber 163218-15-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,3,2,1 and 8 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 163218-15: (8*1)+(7*6)+(6*3)+(5*2)+(4*1)+(3*8)+(2*1)+(1*5)=113 113 % 10 = 3 So 163218-15-3 is a valid CAS Registry Number.
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1,1-dimethylethyl ester