The CAS Registry Mumber 1016-99-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,0,1 and 6 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 1016-99: (6*1)+(5*0)+(4*1)+(3*6)+(2*9)+(1*9)=55 55 % 10 = 5 So 1016-99-5 is a valid CAS Registry Number.
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