The CAS Registry Mumber 89339-41-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,3,3 and 9 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 89339-41: (7*8)+(6*9)+(5*3)+(4*3)+(3*9)+(2*4)+(1*1)=173 173 % 10 = 3 So 89339-41-3 is a valid CAS Registry Number.
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