The CAS Registry Mumber 144030-99-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,4,0,3 and 0 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 144030-99: (8*1)+(7*4)+(6*4)+(5*0)+(4*3)+(3*0)+(2*9)+(1*9)=99 99 % 10 = 9 So 144030-99-9 is a valid CAS Registry Number.
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