The CAS Registry Mumber 477597-99-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,7,7,5,9 and 7 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 477597-99: (8*4)+(7*7)+(6*7)+(5*5)+(4*9)+(3*7)+(2*9)+(1*9)=232 232 % 10 = 2 So 477597-99-2 is a valid CAS Registry Number.
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