The CAS Registry Mumber 5162-78-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,1,6 and 2 respectively; the second part has 2 digits, 7 and 8 respectively. Calculate Digit Verification of CAS Registry Number 5162-78: (6*5)+(5*1)+(4*6)+(3*2)+(2*7)+(1*8)=87 87 % 10 = 7 So 5162-78-7 is a valid CAS Registry Number.
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