1.drugname - Optional. The name to be displayed on screens.
2.lignum - Ligand 3-letter code, multiple ligands are separated by commas.
3.subs - Optional. Lists of comma-separated atoms to be selected for each ligand respectively, separated by |.
Empty string: Default selection (Heteroatom), e.g., subs=N3,N8||N1,O5
_: Select none, e.g., subs=N3,N8|_|N1,O5
If "subs" has more than "lignum", extra atom lists will be ignored, e.g., lignum=STI,STU&subs=N3,N8|N3,O6|N1,O5.
If "subs" has less than "lignum", last atom list will be applied to all the rest of ligands, e.g., lignum=STI,STU,UCN&subs=N3,N8|N3,O6.
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