The CAS Registry Mumber 111559-77-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,1,5,5 and 9 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 111559-77: (8*1)+(7*1)+(6*1)+(5*5)+(4*5)+(3*9)+(2*7)+(1*7)=114 114 % 10 = 4 So 111559-77-4 is a valid CAS Registry Number.
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