The CAS Registry Mumber 2889-04-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,8,8 and 9 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 2889-04: (6*2)+(5*8)+(4*8)+(3*9)+(2*0)+(1*4)=115 115 % 10 = 5 So 2889-04-5 is a valid CAS Registry Number.
Reaction of beta-(10-phenothiazinyl)-propionic acid with sulfonamides, together with a contribution to the reaction mechanism of the carbodiimide method
Braeuniger,Delzer
, p. 279 - 280 (2007/10/09)
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