The CAS Registry Mumber 1089339-66-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,8,9,3,3 and 9 respectively; the second part has 2 digits, 6 and 6 respectively. Calculate Digit Verification of CAS Registry Number 1089339-66: (9*1)+(8*0)+(7*8)+(6*9)+(5*3)+(4*3)+(3*9)+(2*6)+(1*6)=191 191 % 10 = 1 So 1089339-66-1 is a valid CAS Registry Number.
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