Discovery of an orally bioavailable NK1 receptor antagonist, (2S,3S)-(2-methoxy-5-tetrazol-1-ylbenzyl)(2-phenylpiperidin-3-yl)amine (GR203040), with potent antiemetic activity. gan Ward, P, Armour, DR, Bays, D, Evans, B, Giblin, G, Heron, N, Hubbard, T, Liang, K, Middlemiss, D, Mordaunt, J