The structure of the sex pheromone (attractant) of the female tsetse fly has been confirmed by the following synthesis. Compound C appears to be identical to the natural pheromone in all respects (including the response of the male tsetse fly). Provide structures for A, B, and C.

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(1) 2 (CsHs)aP H2, Pt Br | | | -B (C37H72) 7