Hello Cctbx and Phenix developers, as you know, extended CCD codes arrive this year. I'm looking into examples https://github.com/wwPDB/extended-wwPDB-identifier-examples and thinking what's the best way to convert such files to PDB. Do you plan anything in this matter, like it was done with https://cci.lbl.gov/hybrid_36/ in the past? Tentatively, I'm thinking about mapping residue names in the HETNAM record. For example, BB87Q would be mapped to a "3 letter code" that code would have a special character to make it different from normal 3-letter codes (let's say '%', or maybe '+' or '_' - I don't have a strong preference), and the original CCD code would be given in columns 72-79 of HETNAM that are currently unused: HETNAM BB% PHOSPHOSERINE [...] BB87Q