The CAS Registry Mumber 28907-44-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,9,0 and 7 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 28907-44: (7*2)+(6*8)+(5*9)+(4*0)+(3*7)+(2*4)+(1*4)=140 140 % 10 = 0 So 28907-44-0 is a valid CAS Registry Number.
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