Convert format

Title:

Ribose atom symbol:

• do not change
• ribose symbol *
• ribose symbol '

Phosphate group nomenclature:

• do not change
• OP1, OP2
• O1P, O2P

Residue name position:

• do not change
• column 18
• column 19
• column 20

Residue flag:

• do not change
• all ATOM
• all HETATM
• HETATM for modified nucleotides

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