The below-mentioned general formula the chemical compound which is displayed with (1) or that salt.[In formula, X the below-mentioned general formula (2) - general system in each case is chosen displays the basis which is displayed at one from the group which consists of (5).General system (2) - (5) in,21 R the hydrogen atom, the hydroxy basis, displays the alkyl group, the alkyl thio basis or the amino group,31 R,32 R,41 R and42 R display the respective hydrogen atom or the alkyl group,51 R,52 R and53 R the respective hydrogen atom, the hydroxy basis, the alkyl group, the merukaputo basis and the alkyl thio basis, the amino group, display the terrorist ring basis to alkoxy group, phosphorus acid radical or aromatic. ]下記一般式(1)で表される化合物又はその塩。[式中、Xは下記一般式(2)~一般式(5)からなる群より選ばれるいずれか1つで表される基を表す。一般式(2)~(5)中、R21は水素原子、ヒドロキシ基、アルキル基、アルキルチオ基又はアミノ基を表し、R31、R32、R41及びR42はそれぞれ水素原子又はアルキル基を表し、R51、R52及びR53はそれぞれ水素原子、ヒドロキシ基、アルキル基、メルカプト基、アルキルチオ基、アミノ基、アルコキシ基、リン酸基又は芳香族へテロ環基を表す。]
