Aminopyridine derivatives having aurora A selective inhibitory action
The present invention relates to a compound of formula I: ##STR00001## wherein: R.sub.1 is a hydrogen atom, F, CN, etc.; R.sub.1\' is a hydrogen atom or lower alkyl which may be substituted; R.sub.2 is O, S, SO, SO.sub.2, etc.; R.sub.3 is a phenyl which may be substituted; X.sub.1, X.sub.2, and X.sub.3 each independently CH, N, etc. provided, however, that among X.sub.1, X.sub.2 and X.sub.3, the number of nitrogen is 0 or 1; W is the following residue: ##STR00002## wherein: W.sub.1, W.sub.2, and W.sub.3 each independently CH, N, etc., or a pharmaceutically acceptable salt or ester thereof.
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