The CAS Registry Mumber 84066-41-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,0,6 and 6 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 84066-41: (7*8)+(6*4)+(5*0)+(4*6)+(3*6)+(2*4)+(1*1)=131 131 % 10 = 1 So 84066-41-1 is a valid CAS Registry Number.
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