We present new high signal-to-noise ratio spectra of the components B and C
of the gravitational lensing system MG 2016+112. We show that image C disp
lays strong emission lines of Ly alpha, NV, CIV, Hell, and CIII] redshifted
to z = 3.27, similar to images A and B. We examine the emission-line flux
ratios in order to put constraints on the lens models as well as to investi
gate the intrinsic nature of MG 2016+112. The observed line ratios of B and
C are consistent with those expected in the simple photo-ionization models
for narrow-line region of active galactic nuclei (AGN) except for the enha
nced NV lines. The line ratios difference of components B and C can be inte
rpreted as a difference in ionization parameters. This result is consistent
with lens model prediction that C is a fold image of a slightly outer part
of the nucleus. MG 2016+112 is known to be very unique among the high-reds
hift AGN; it is neither an ordinary broad-line quasar nor a powerful radio
galaxy as indicated by the width and flux ratio of the emission lines. Toge
ther with other observed properties discussed in Literature, we argue that
MG 2016+112 may be an obscured luminous radio-quiet quasar.