bugfix

src/BioHelpers_FABER/rmsd.py

@@ -163,7 +163,7 @@ def __get_chain_from_file(file: str) -> pdb.Chain.Chain:
         chain = next(structure.get_chains())
         return chain
     elif extension == ".cif":
-        structure = pdb.MMCifParser().get_structure("", file)[0]
+        structure = pdb.MMCIFParser().get_structure("", file)[0]
         chain = next(structure.get_chains())
         return chain
     else: