The CAS Registry Mumber 16958-96-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,9,5 and 8 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 16958-96: (7*1)+(6*6)+(5*9)+(4*5)+(3*8)+(2*9)+(1*6)=156 156 % 10 = 6 So 16958-96-6 is a valid CAS Registry Number.
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