The CAS Registry Mumber 84011-90-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,0,1 and 1 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 84011-90: (7*8)+(6*4)+(5*0)+(4*1)+(3*1)+(2*9)+(1*0)=105 105 % 10 = 5 So 84011-90-5 is a valid CAS Registry Number.
An Incremental Approach to Hosts That Mimic Serine Proteases
Cram, Donald J.,Katz, Howard Edan
, p. 135 - 137 (1983)
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