The CAS Registry Mumber 89444-17-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,4,4 and 4 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 89444-17: (7*8)+(6*9)+(5*4)+(4*4)+(3*4)+(2*1)+(1*7)=167 167 % 10 = 7 So 89444-17-7 is a valid CAS Registry Number.
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