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A simple BRST-closed expression for the color-ordered super-Yang-Mills5-point amplitude at tree-level is proposed in pure spinor superspace and shownto be BRST-equivalent to the field theory limit of the open superstring 5-ptamplitude. It is manifestly cyclic invariant and each one of its five terms canbe associated to the five Feynman diagrams which use only cubic vertices. Itsform also suggests an empirical method to find superspace expressions in thecohomology of the pure spinor BRST operator for higher-point amplitudes basedon their kinematic pole structure. Using this method, Ansaetze for the 6- and7-point 10D super-Yang-Mills amplitudes which map to their 14 and 42color-ordered diagrams are conjectured and their 6- and 7-gluon expansions areexplicitly computed.

Towards Field Theory Amplitudes From the Cohomology of Pure Spinor Superspace