The CAS Registry Mumber 116671-33-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,6,6,7 and 1 respectively; the second part has 2 digits, 3 and 3 respectively. Calculate Digit Verification of CAS Registry Number 116671-33: (8*1)+(7*1)+(6*6)+(5*6)+(4*7)+(3*1)+(2*3)+(1*3)=121 121 % 10 = 1 So 116671-33-1 is a valid CAS Registry Number.
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