The CAS Registry Mumber 68649-18-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,6,4 and 9 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 68649-18: (7*6)+(6*8)+(5*6)+(4*4)+(3*9)+(2*1)+(1*8)=173 173 % 10 = 3 So 68649-18-3 is a valid CAS Registry Number.
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