The CAS Registry Mumber 91174-16-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,1,7 and 4 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 91174-16: (7*9)+(6*1)+(5*1)+(4*7)+(3*4)+(2*1)+(1*6)=122 122 % 10 = 2 So 91174-16-2 is a valid CAS Registry Number.
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