The CAS Registry Mumber 111503-99-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,1,5,0 and 3 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 111503-99: (8*1)+(7*1)+(6*1)+(5*5)+(4*0)+(3*3)+(2*9)+(1*9)=82 82 % 10 = 2 So 111503-99-2 is a valid CAS Registry Number.
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