The chemical compound which possesses formula (i) (in formula, as for R, R, R, R, R and R as defined in this bill, is) and the manner which it produces and uses that and is disclosed.式(I)を有する化合物(式中、R1、R2、R3、R4、R5およびR6は本明細書に定義される通りである)ならびにそれを製造および使用する方法が開示される。