(2S,5R)-5-Hydroxypiperidine-2-carboxylic acid is a specific stereoisomer of 5-hydroxypipecolic acid, also known as a trans-5-hydroxy-L-pipecolic acid. It is a cyclic amino acid with a piperidine ring, containing both a carboxylic acid group at the 2-position and a hydroxyl group at the 5-position.