If you want to use RasMol to view the structures in the IUMSC database, you must have the corresponding .pdb file. While many of the later structures have the .pdb file, earlier structure have only the .crt file. You can download a simple conversion program that works in a DOS window to convert the .crt files to the .pdb format. The program assumes that the input file name is crt, and the output is pdb. Typically the user would do the following (using 96112.crt as the example).

(save the 96112.crt file from the library)
COPY 96112.CRT CRT
CRT2PDB
COPY PDB 96112.PDB

You can the execute the RasMol program with:

RASMOL 96112.PDB

You are welcome to download the CRT2PDB.EXE program, but you do so at your own risk--we cannot support it or be responsible for any errors.

Download CRT2PDB.EXE