[ccp4bb]: how to create modified cysteines

[John Bruning]

Title: how to create modified cysteines

Hi,
I a have a structure that is defined in its pdb as a normal cysteine. I would like to mutate it to a BME modified cysteine (which I think is defined as CSS in the standard library).  How do I do this-  how do I create the pbd and proper library files?

Thanks,
John Bruning