The CAS Registry Mumber 77097-81-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,0,9 and 7 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 77097-81: (7*7)+(6*7)+(5*0)+(4*9)+(3*7)+(2*8)+(1*1)=165 165 % 10 = 5 So 77097-81-5 is a valid CAS Registry Number.
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