The CAS Registry Mumber 146109-61-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,6,1,0 and 9 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 146109-61: (8*1)+(7*4)+(6*6)+(5*1)+(4*0)+(3*9)+(2*6)+(1*1)=117 117 % 10 = 7 So 146109-61-7 is a valid CAS Registry Number.
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