The CAS Registry Mumber 66007-51-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,0,0 and 7 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 66007-51: (7*6)+(6*6)+(5*0)+(4*0)+(3*7)+(2*5)+(1*1)=110 110 % 10 = 0 So 66007-51-0 is a valid CAS Registry Number.
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