6-[[1-Oxo-6-[[(phenylmethoxy)carbonyl]amino]hexyl]amino]-hexanoic Acid 2,5-Dioxo-1-pyrrolidinyl Ester is an intermediate in synthesizing 1,8-Diaza-2,9-diketocyclotetradecane (D417643). A dimer of Caprolactam (C175665), a monomer used in the production of nylon-6 and other synthetic polymers.