The CAS Registry Mumber 84507-59-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,5,0 and 7 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 84507-59: (7*8)+(6*4)+(5*5)+(4*0)+(3*7)+(2*5)+(1*9)=145 145 % 10 = 5 So 84507-59-5 is a valid CAS Registry Number.
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