  Given a Lie algebra with a scalar product, one may consider the latter as a
symplectic structure on a $dg$-scheme, which is the spectrum of the
Chevalley--Eilenberg algebra. In the first section we explicitly calculate the
first order deformation of the differential on the Hochschild complex of the
Chevalley--Eilenberg algebra. The answer contains the Duflo character. This
calculation is used in the last section. There we sketch the definition of the
Wilson loop invariant of knots, which is hopefully equal to the Kontsevich
integral, and show that for unknot they coincide. As a byproduct we get a new
proof of the Duflo isomorphism for a Lie algebra with a scalar product.
