4-{4-[(E)-4-(3-Hydroxy-4-nitro-phenyl)-but-3-en-1-ynyl]-phenyl}-piperazine-1-carboxylic acid tert-butyl ester
tert-butyl 4-(4-(3-hydroxyprop-1-ynyl)phenyl)piperazine-1-carboxylate
4-[4-(3-Oxo-prop-1-ynyl)-phenyl]-piperazine-1-carboxylic acid tert-butyl ester
tert-butyl 4-(4-iodophenyl)tetrahydro-1(2H)-pyrazinecarboxylate
4-phenyl-piperazine-1-carboxylic acid tert-butyl ester