The CAS Registry Mumber 68891-64-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,8,9 and 1 respectively; the second part has 2 digits, 6 and 4 respectively. Calculate Digit Verification of CAS Registry Number 68891-64: (7*6)+(6*8)+(5*8)+(4*9)+(3*1)+(2*6)+(1*4)=185 185 % 10 = 5 So 68891-64-5 is a valid CAS Registry Number.
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