Hi @beginner
Thanks a lot for reaching out!
So I have checked with our developers (apologies, this can take a while most of the times):
regarding the writing of mol data via the RDKit cartridge a bug ticket has been opened. You also might check out this post: sdf mol_file type to rdkit mol type
Regarding the chemistry type handling in the DB nodes I added your request to the ticket. As far as I know they encountered unexpected problems with the AdapterCell implementation. So no solution yet, but they’re on it 
Hope I have better news soon!
Best,
Alice