  In this paper we construct extensions of the Mixed Hodge structure on the
fundamental group of a pointed algebraic curve. These extensions correspond to
the regulator of certain explicit motivic cohomology cycles in the self product
of the curve which were first constructed by Bloch and Beilinson. This leads to
a new iterated integral expression for the regulator. Our result is a
generalization of a result of Colombo's where she constructs the extension
corresponding to a motivic cycle class in the Jacobian of a hyperelliptic curve
constructed by Collino. This is to appear in the Mathematical Proceedings of
the Indian Academy of Sciences.
