tert-Butyl 4-(3-hydroxybenzyl)piperazine-1-carboxylate

tert-butyl 4-(4-cyanooxan-4-yl)piperazine-1-carboxylate

4-(1H-吡咯并[2,3-B]吡啶-4-基)-1-哌嗪羧酸叔丁酯

1-(4-氯邻甲苯)哌嗪

4-氯羰基-哌嗪-1-羧酸叔丁酯