In the "RDKit One Component Reaction" node, is it possible to have a tick box to parse out the "Data Fields" from prior to the node execution. It does seem strange that all information gets lost after the node requiring the use of Joiner nodes to get it back again.
I have put this on our list. I think this should be possible without too much effort. I guess we did not do it so far because you may get a lot of duplicates of the "Data Fields" if there are many different products for the same reactant in the result table. But that should not be a show stopper.