| abstract |
1. The compound of formula (I) or a salt thereof: wherein A is cycloalkyl which may be substituted, cycloalkenyl which may be substituted, or nitrogen-containing heterocycle which may be substituted, X represents CR or N, R represents H, OR, NRR, SR, halogen, cyano or lower alkyl, aryl or heterocycle, Y represents H, OR, NRR, SR, halogen, cyano, lower alkyl which can be substituted, aryl which can be substituted, or heterocycle which can be substituted, Z represents H or lower alkyl, R, R, R and R are the same or o personal from each other and represent H or lower alkyl, R represents H, OH, - (CRR) -R, -SO-R or a heterocycle which may be substituted, R and R are identical or different from each other and represent H, halogen , OH, lower alkyl which may be substituted, aryl which may be substituted, or a heterocycle which may be substituted, R and R are combined with each other to form oxo (= O), or R and R may be combined with the carbon atom with which they bound to form a cycloalkyl which may be substituted, R represents H, halogen, cyano, —NRR, aryl which may be substituted, cycloalkyl which may be substituted, or a heterocycle which may be substituted, R and R are identical or different from each other and represent H, lower alkyl which may be substituted, or aryl which may be substituted, R represents NRR or lower alkyl which may be substituted, or a heterocycle which may be substituted, R and R are identical or different from each other and represent H, lower alkyl which may be substituted, or aryl which may be |