The CAS Registry Mumber 68244-81-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,2,4 and 4 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 68244-81: (7*6)+(6*8)+(5*2)+(4*4)+(3*4)+(2*8)+(1*1)=145 145 % 10 = 5 So 68244-81-5 is a valid CAS Registry Number.
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