The CAS Registry Mumber 68638-28-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,6,3 and 8 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 68638-28: (7*6)+(6*8)+(5*6)+(4*3)+(3*8)+(2*2)+(1*8)=168 168 % 10 = 8 So 68638-28-8 is a valid CAS Registry Number.
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