The CAS Registry Mumber 4049-18-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,0,4 and 9 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 4049-18: (6*4)+(5*0)+(4*4)+(3*9)+(2*1)+(1*8)=77 77 % 10 = 7 So 4049-18-7 is a valid CAS Registry Number.
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