[Python] Error occurred while selecting a specific atom in a PDB file using Biopython...

The following is a partial content of my PDB file. I want to set the C2 atom as the coordinate origin, but the code shows an error.

HETATM 1 C1 UNL A 1 -2.791 -1.310 0.787 1.00 0.00 C
HETATM 2 C2 UNL A 1 -3.711 -0.441 0.007 1.00 0.00 C
HETATM 3 C3 UNL A 1 -3.059 0.725 -0.664 1.00 0.00 C
HETATM 4 C4 UNL A 1 -2.098 1.359 0.308 1.00 0.00 C
HETATM 5 C5 UNL A 1 -1.114 0.285 0.724 1.00 0.00 C
HETATM 6 O1 UNL A 1 -1.813 -0.636 1.488 1.00 0.00 O
HETATM 7 O2 UNL A 1 -0.433 -0.261 -0.324 1.00 0.00 O
HETATM 8 C6 UNL A 1 0.922 -0.022 -0.191 1.00 0.00 C
HETATM 9 C7 UNL A 1 1.725 -1.297 -0.057 1.00 0.00 C
HETATM 10 C8 UNL A 1 3.160 -0.900 0.201 1.00 0.00 C


the code is,

import numpy as np
import residue as residue
from Bio.PDB.PDBParser import PDBParser

parser = PDBParser()
structure = parser.get_structure('CEL', 'cel.pdb')
origin = structure[0]['A'][1]


KeyError: (' ', 1, ' ')

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