The CAS Registry Mumber 87713-59-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,7,1 and 3 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 87713-59: (7*8)+(6*7)+(5*7)+(4*1)+(3*3)+(2*5)+(1*9)=165 165 % 10 = 5 So 87713-59-5 is a valid CAS Registry Number.
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