Version 5.6 (2016/05/02) of chemmacros comes with a whole bunch of improvements and changes – no breaking changes, though. Here’s an overview over the changes:
As of version 5.5 the chemmacros package includes a new module named polymers. Currently it mostly defines a few macros for usage in the \iupac command (provided by the mandatory nomenclature module) such as
Recently two questions on TeX.sx popped up about a way to draw cellulose.
Just a quick note: Joseph Wright has written a short series about ChemFig that is worth a look! Part I: ChemFig basics Part II: Customizing appearance Part III: Exploring ChemFig further