2,7-Diazaspiro[4.5]decan-1-one Hydrochloride is a reagent used in the discovery of a potent small-molecule inhibitor of WNT signaling, 8-[3-Chloro-5-[4-(1-methyl-1H-pyrazol-4-yl)phenyl]pyridin-4-yl]-2,8-diazaspiro[4,5]decan-1-one, with good oral pharmacokinetics.