The CAS Registry Mumber 103991-36-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,3,9,9 and 1 respectively; the second part has 2 digits, 3 and 6 respectively. Calculate Digit Verification of CAS Registry Number 103991-36: (8*1)+(7*0)+(6*3)+(5*9)+(4*9)+(3*1)+(2*3)+(1*6)=122 122 % 10 = 2 So 103991-36-2 is a valid CAS Registry Number.
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