The CAS Registry Mumber 148581-44-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,8,5,8 and 1 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 148581-44: (8*1)+(7*4)+(6*8)+(5*5)+(4*8)+(3*1)+(2*4)+(1*4)=156 156 % 10 = 6 So 148581-44-6 is a valid CAS Registry Number.
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