The Spongistatins: Architecturally Complex Natural Products-Part Two: Synthesis of the C(29-51) Subunit, Fragment Assembly, and Final Elaboration to (+)-Spongistatin 2 Financial Support Was Provided by the National Institutes of Health (national Cancer Institute) Through Grant CA-70329, a NIH Postdoctoral Fellowship to C.S.B., a Japan Society for Promotion of Science Fellowship to N.M., and a Royal Society Fulbright Fellowship to V.A.D. We Also Thank the Daiichi Pharmaceutical Co., Ltd, and The…