The CAS Registry Mumber 199597-08-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,9,5,9 and 7 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 199597-08: (8*1)+(7*9)+(6*9)+(5*5)+(4*9)+(3*7)+(2*0)+(1*8)=215 215 % 10 = 5 So 199597-08-5 is a valid CAS Registry Number.
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