The compounds of the formula ##STR1## wherein X is a lower alkylsulphonyl, phenylsulphonyl, cyano, carbonamido, carboxylic acid or carboxylic acid ester group; Y is hydrogen, lower alkyl, phenyl or nitrophenyl; and Z is nitro, cyano or carbonamido.
该公式中的化合物为##STR1##,其中X为较低的烷基磺酰基,苯基磺酰基,
氰基,
羧酸或
羧酸酯基团;Y为氢,较低的烷基,苯基或
硝基苯基;Z为硝基,
氰基或碳酰胺基。