Pranlukast (hemihydrate) (Standard) is the analytical standard of Pranlukast (hemihydrate). This product is intended for research and analytical applications. Pranlukast hemihydrate is a highly potent, selective and competitive antagonist of peptide leukotrienes. Pranlukast inhibits [3H]LTE4, [3H]LTD4, and [3H]LTC4 bindings to lung membranes with Kis of 0.630.11, 0.990.19, and 5640680 nM, respectively.