One of the richest regions for complex interstellar molecules
is Sagittarius B2 (N), called for this reason the "Large Molecule Heimat".
We have used the new 3 mm capability of the Australia Telescope Compact
Array to search Sgr B2 LMH for molecules of biological significance
- glycine, the simplest amino acid, and propylene oxide, a simple chiral
molecule.

I will discuss the background to this search, why these molecules are
significant, the ATCA results (upper limits) and the potential of the ATCA
as a sensitive millimetre interferometer, and the only one in the southern
hemisphere.

I will also present some results of ATCA 3 mm HCO+, HCN and
continuum and 6 cm formaldehyde observations of molecular cloud G291.3-0.7.