  We present the results from the analysis of the composite spectrum of five
near-IR luminous (K < 20) galaxies at z~2. Several of the strongest absorption
lines are present in the merging galaxy NGC 6090 UV spectrum and are not
present in the spectra of Lyman Break Galaxies at z~3. They were identified as
SiIII 1296, CIII 1428, SiII 1485, and Fe 1380 which are photospheric lines
typical of B stars. A metallicity higher than solar is suggested by comparing
the pure photospheric lines known as the 1425AA index (SiIII, CIII, FeV) with
Starburst99 models. The evidence of high metallicity, together with the high
masses, high star-formation rates, and possibly strong clustering, suggest that
these galaxies are candidates to become massive spheroids.
