The CAS Registry Mumber 74654-70-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,6,5 and 4 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 74654-70: (7*7)+(6*4)+(5*6)+(4*5)+(3*4)+(2*7)+(1*0)=149 149 % 10 = 9 So 74654-70-9 is a valid CAS Registry Number.
Tamelen, E. E. van,Demers, J. P.,Taylor, E. G.,Koller, K.
, p. 5424 - 5425 (2007/10/02)
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