I'm trying to create a figure showing some different possible chemical structures of the butane molecule in the form of the right most diagrams in the below image and I'd like to know the best way to go about this. My preliminary research suggests the
chemfig package is a good choice for most chemical structures, and it would certainly be capable of those in the first and middle columns, but I can't figure out how to use it to create something like those in the last column, or whether it's even capable of it.
Can anyone suggest how I might go about this in Latex? Or should I be looking at external programs like ChemDraw?