The CAS Registry Mumber 77573-39-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,5,7 and 3 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 77573-39: (7*7)+(6*7)+(5*5)+(4*7)+(3*3)+(2*3)+(1*9)=168 168 % 10 = 8 So 77573-39-8 is a valid CAS Registry Number.
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