The Galactic Center (GC) is still the most enigmatic region in the Galaxy. Highly
compressed and turbulent molecular cloud complex in the central few hundred parsecs -
the Central Molecular Zone (CMZ) - shows a lot of peculiar molecular features. One of
such features is the infrared Double Helix Nebula (DHN) discovered by Morris et
al. (2006).

Recently, Enokiya et al. (2014) carried out large scale and high resolution (4 x 2
degrees and ~ 100กษ respectively) CO observations toward the CMZ with the NANTEN2 4m
radio telescope and first detected two possible molecular counterparts to the DHN. The
two molecular counterparts are extending from the DHN to the circumnuclear disk which is
the high pressure rotating gas ring surrounding the super massive black hole, Sgr
A*. Spatial-velocity distribution of CO and physical parameters derived from our data
indicate one possible scenario, magnetic tower jet model. I will briefly summarize a
global aspects and pc-scale peculiar features in the GC in the talk.