The CAS Registry Mumber 5609-66-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,6,0 and 9 respectively; the second part has 2 digits, 6 and 6 respectively. Calculate Digit Verification of CAS Registry Number 5609-66: (6*5)+(5*6)+(4*0)+(3*9)+(2*6)+(1*6)=105 105 % 10 = 5 So 5609-66-5 is a valid CAS Registry Number.
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