The CAS Registry Mumber 69389-43-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,3,8 and 9 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 69389-43: (7*6)+(6*9)+(5*3)+(4*8)+(3*9)+(2*4)+(1*3)=181 181 % 10 = 1 So 69389-43-1 is a valid CAS Registry Number.
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