The CAS Registry Mumber 70449-72-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,0,4,4 and 9 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 70449-72: (7*7)+(6*0)+(5*4)+(4*4)+(3*9)+(2*7)+(1*2)=128 128 % 10 = 8 So 70449-72-8 is a valid CAS Registry Number.
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