The CAS Registry Mumber 5368-72-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,3,6 and 8 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 5368-72: (6*5)+(5*3)+(4*6)+(3*8)+(2*7)+(1*2)=109 109 % 10 = 9 So 5368-72-9 is a valid CAS Registry Number.
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