Hello,

To build a model for a coarse-grained polyester resin, I would like to use the model developed by Giulia Rossi et al (Macromolecules 2011, 44, 6198-6208).

In this model, the R1-R2, R2-R3 and R3-R1 bonds are constrained. I would to know how to constrain these bonds.

Regards

Tony Lv