The CAS Registry Mumber 161958-00-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,1,9,5 and 8 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 161958-00: (8*1)+(7*6)+(6*1)+(5*9)+(4*5)+(3*8)+(2*0)+(1*0)=145 145 % 10 = 5 So 161958-00-5 is a valid CAS Registry Number.
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