The CAS Registry Mumber 115900-56-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,5,9,0 and 0 respectively; the second part has 2 digits, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 115900-56: (8*1)+(7*1)+(6*5)+(5*9)+(4*0)+(3*0)+(2*5)+(1*6)=106 106 % 10 = 6 So 115900-56-6 is a valid CAS Registry Number.
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