The CAS Registry Mumber 99598-11-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,5,9 and 8 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 99598-11: (7*9)+(6*9)+(5*5)+(4*9)+(3*8)+(2*1)+(1*1)=205 205 % 10 = 5 So 99598-11-5 is a valid CAS Registry Number.
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