The CAS Registry Mumber 89326-42-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,3,2 and 6 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 89326-42: (7*8)+(6*9)+(5*3)+(4*2)+(3*6)+(2*4)+(1*2)=161 161 % 10 = 1 So 89326-42-1 is a valid CAS Registry Number.
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