Extract Text Label for RGroup Molecule (R1, R2. etc)

Hi, I have done a R-group decomposition. It looks like the following. On the ligand table header, if the molecules were converted to pictures, it reads R1 or R2. I couldn't figure out how to extract the text from molecule using API. Could someone please help?

 

Hi,

Given the molecule that's displayed as "R1" you only have to get the first atom of this molecule, and get it's rgroupID:

http://www.chemaxon.com/marvin/help/developer/beans/api/chemaxon/struc/MolAtom.html#getRgroup%28%29

 

Regards,

Robert