The CAS Registry Mumber 16600-20-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,6,0 and 0 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 16600-20: (7*1)+(6*6)+(5*6)+(4*0)+(3*0)+(2*2)+(1*0)=77 77 % 10 = 7 So 16600-20-7 is a valid CAS Registry Number.
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