(3S,5S)-2-acetyl-1-(2,4-dinitrophenyl)-5-hydroxypiperazic acid

(3S,5S)-5-Acetoxy-tetrahydro-pyridazine-1,2,3-tricarboxylic acid 1,2-di-tert-butyl ester 3-methyl ester

(3S,5S)-5-Acetoxy-1-(2,4-dinitro-phenyl)-hexahydro-pyridazine-3-carboxylic acid methyl ester