The CAS Registry Mumber 91771-39-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,7,7 and 1 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 91771-39: (7*9)+(6*1)+(5*7)+(4*7)+(3*1)+(2*3)+(1*9)=150 150 % 10 = 0 So 91771-39-0 is a valid CAS Registry Number.
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