Piperazine citrate, an organic compound, consists of a six-membered ring, containing two nitrogen atoms at opposite positions in the ring.

IPSU is an antagonist of OX2 receptor. IPSU Exhibits approximately six-fold selectivity for OX2 versus OX1 receptors.

Chymase-IN-1 is a selective, orally active inhibitor of human mast cell chymase (IC50: 29 nM).