The CAS Registry Mumber 96807-07-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,8,0 and 7 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 96807-07: (7*9)+(6*6)+(5*8)+(4*0)+(3*7)+(2*0)+(1*7)=167 167 % 10 = 7 So 96807-07-7 is a valid CAS Registry Number.
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