The CAS Registry Mumber 449745-90-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,9,7,4 and 5 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 449745-90: (8*4)+(7*4)+(6*9)+(5*7)+(4*4)+(3*5)+(2*9)+(1*0)=198 198 % 10 = 8 So 449745-90-8 is a valid CAS Registry Number.
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