The CAS Registry Mumber 97939-72-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,7,9,3 and 9 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 97939-72: (7*9)+(6*7)+(5*9)+(4*3)+(3*9)+(2*7)+(1*2)=205 205 % 10 = 5 So 97939-72-5 is a valid CAS Registry Number.
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