I wanted to use the Chemical File Writer node to write sdf files, which in principle works - but: having 3d-coordinates are erased, the node only writes 0.0000. I assume that is because it converts no matter what.
I like using this node since it is easy to use for example in loops or to continue your workflow without the need of variable "tricks". But in the case of working with 3d coordinates, it is unfortunately not useful.
(For now, I can use the standard sdf writer for some of my work-flows)