If you search RCSB PDB for the ligand, using

http://ligand-expo.rcsb.org/ld-search.html

and

http://www.rcsb.org/pdb/ligand/chemAdvSearch.do

G7M and H0P3 are different ligands, N7-METHYL-GUANOSINE-5'-MONOPHOSPHATE and 2-(3-hydroxyphenyl)-N-(pyridin-3-yl)acetamide, respectively. If your protein contains part of the heterocompound, you can place the complete model by superposition of the ideal model on the part that is visible, otherwise you would have to use docking.

According to Annemarie Honegger information your ligand can be easily parametrized with the combination of Gaussian and Antechamber, however, it is not possible to observe thr ligand you attached.