The CAS Registry Mumber 1165709-81-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,6,5,7,0 and 9 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1165709-81: (9*1)+(8*1)+(7*6)+(6*5)+(5*7)+(4*0)+(3*9)+(2*8)+(1*1)=168 168 % 10 = 8 So 1165709-81-8 is a valid CAS Registry Number.
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