The present invention provides a compound represented by Formula (I): ##STR00001## [wherein R.sup.1 represents CONR.sup.1aR.sup.1b (wherein R.sup.1a and R.sup.1b may be the same or different and each represents a hydrogen atom, substituted or unsubstituted lower alkyl, substituted or unsubstituted aryl, substituted or unsubstituted ararkyl or a substituted or unsubstituted heterocyclic group, or R.sup.1a and R.sup.1b are combined together with the adjacent nitrogen atom thereto to form a substituted or unsubstituted heterocyclic group) or the like, R.sup.2 represents a hydrogen atom, CONR.sup.2aR.sup.2b (wherein R.sup.2a and R.sup.2b may be the same or different and each represents a hydrogen atom, substituted or unsubstituted lower alkyl, substituted or unsubstituted aryl, substituted or unsubstituted ararkyl or a substituted or unsubstituted heterocyclic group, or R.sup.2a and R.sup.2b are combined together with the adjacent nitrogen atom thereto to form a substituted or unsubstituted heterocyclic group), NR.sup.2cR.sup.2d (wherein R.sup.2c and R.sup.2d may be the same or different and each represents a hydrogen atom, substituted or unsubstituted lower alkyl, substituted or unsubstituted lower alkanoyl, substituted or unsubstituted aroyl, substituted or unsubstituted heteroaroyl, substituted or unsubstituted ararkyl, substituted or unsubstituted lower alkylsulfonyl or substituted or unsubstituted lower arylsulfonyl) or the like].

 
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