The CAS Registry Mumber 57771-89-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,7,7 and 1 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 57771-89: (7*5)+(6*7)+(5*7)+(4*7)+(3*1)+(2*8)+(1*9)=168 168 % 10 = 8 So 57771-89-8 is a valid CAS Registry Number.
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