The CAS Registry Mumber 108664-95-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,8,6,6 and 4 respectively; the second part has 2 digits, 9 and 5 respectively. Calculate Digit Verification of CAS Registry Number 108664-95: (8*1)+(7*0)+(6*8)+(5*6)+(4*6)+(3*4)+(2*9)+(1*5)=145 145 % 10 = 5 So 108664-95-5 is a valid CAS Registry Number.
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