The CAS Registry Mumber 99474-54-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,4,7 and 4 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 99474-54: (7*9)+(6*9)+(5*4)+(4*7)+(3*4)+(2*5)+(1*4)=191 191 % 10 = 1 So 99474-54-1 is a valid CAS Registry Number.
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