 This ring is also universally catenary, as its localization at every prime ideal is a quotient of a regular ring.Nagata's example of a 2-dimensional Noetherian local ring that is catenary but not universally catenary is a G-ring, and is also a J-2 ring as any local G-ring is a J-2 ring .So it is a quasi-excellent catenary local ring that is not excellent.