Model Conversion Issue: MDL to Data Model

[amgc5]

Hello,

I am in the process of converting MCell3.mdl files to be compatible with MCell4/CellBlender. I received the following warning and error while trying to perform the conversion. I was looking for resources on specific fixes I need to perform on the mdl code to be compatible with MCell4.
ISSUES:
ERROR: TODO_CONVERSION: reactions with 3 reactants are not supported

Question: Not sure which reactants are not being supported? Do I need to look into reaction probabilities or does this have to do with orientation?

WARNING: Partitioning was specified, but it is smaller than the automatically determined bounding box. You may need to increase the partition size if get an error later that a vertex does not fit any partition.

Question: Again, not sure if this would need to be fixed in the MDL/Data Model prior to running the conversion?

I am hoping this is the best space to address these questions?

Thanks,
am