  Same amplitudes evaluated independently using RNS and pure spinor formalism
are expected to agree. While for massless states, this fact has been firmly
established, for massive states such an explicit check has been lacking so far.
We compute all massless-massless-massive 3-point functions in open supertrings
in pure spinor formalism for the first massive states and compare them with the
corresponding RNS results. We fix the normalization of the vertex operators of
the massive states by comparing same set of 3-point functions for a fixed
ordering in the two formalisms. Once fixed, the subsequent 3-point functions
for each inequivalent ordering match exactly. This extends the explicit
demonstration of equivalence of pure spinor and RNS formalism from massless
states to first massive states.
