We prove that the primitive part of the Sinha homology spectral sequence E2-term for the space of long knots is rationally isomorphic to the homotopy epsilon 2-term. We also define natural graph-complexes computing the rational homotopy of configuration and of knot spaces.
Lambrechts, P., & Turchin, V. (2009). Homotopy graph-complex for configuration and knot spaces. Transactions of the American mathematical society, 361(1), 207-222. https://hdl.handle.net/2078.5/133471 (Original work published 2009)