"input-format", string

• smiles
• rsmiles
• molfile

• rxnfile

  "output-format", string, *

• pdf – Portable Document Format

• png – Portable Network Graphics
• svg – Scalable Vector Graphics
• wmf – Enhanced Windows Metafile
• mol – MDL MOLFile (layout)

• rxn – MDL RXNFile (layout)

  "query", boolean

Treat the molecule or reaction as a query. Disabled by default. Enabling it implies showing 'stereo care' boxes on SMILES molecules/reactions with cis-trans bonds, turning off the computation of radicals/valences in SMILES molecules/reactions, and hiding any implicit hydrogens. Note: Enabling this parameter should be done before loading the molecule or reaction.

"image-size", size, *

Width and height of target image.

"bond-length", float, *

The average bond length desired. Overridden by the image-size.

"margin-factor", float

The size of image margin, measured from outermost atom position, relative to average bond length. Default is 1.0, recommended minimum is 0.55.

"output-file", string, *

Target file path.

"relative-thickness", float

Sets the thickness of a bond to rt/30 of the average bond length. Default is 1.0.

"background-color", color

If not set, background is transparent.

"base-color", color

The default color for atoms and bonds. Initially black.

"implicit-hydrogen-mode", string

• none
• terminal
• hetero
• terminalhetero (default)
• all

Atoms on which to make implicit hydrogens visible. This parameter overrides label-mode, e.g. is the latter is set to none and the former – to hetero, all heteroatoms will be visible along with implicit hydrogens, if any.

"coloring", boolean

Atom coloring, e.g. nitrogen is blue, oxygen is red, etc.

"valences-visible", boolean

"atom-ids-visible", boolean

"bond-ids-visible", boolean

"stereo-old-style", boolean

If set, hides stereogroups and displays “Chiral” when appropriate.

"aromatization", string

• aromatize, arom
• dearomatize, dear, dearom
• none (default)

Aromatize, dearomatize or keep the molecule as is.

"label-mode", string

• normal (default) – show heteroatoms, terminal atoms, atoms with radical, charge, isotope or other attribute and atoms having two adjacent bonds in a line
• forceshow – show all atoms
• hideterminal – same as normal, but hide terminal carbons

• forcehide – hide all labels, show only bonds

  "highlight-thickness-enabled", boolean

Enables or disables highlighting by thickness. Disabled by default.

"highlight-color-enabled", boolean

Enables or disables highlighting with color. Enabled by default.

"highlight-color", color

Sets the color to be used for highlighting. Default is red.

"aam-color", color

Atom-by-atom mapping indices color in reactions.

"center-double-bond-when-stereo-adjacent", boolean

Whether or not to force double bond centering when it has two single adjacent bonds, one of which is a stereo (up or down) bond directed towards this double bond. By default disabled.

"comment", string

Put a single-line comment at the top or bottom of the image. If the image size is set explicitly, it must not be smaller than the size of the comment bounding box.

"comment-position", string

• top

• bottom (default)

  "comment-alignment", string

Align comment to either side of the image or center it. Note that this has no effect if comment is larger than the molecule/reaction rendered.

• left
• center (default)

• right

  "comment-font-size", int

Set font size for the comment. The size is set in absolute units, roughly equal to the height in pixels. Default is 20.

"comment-color", color

Color to use for the comment. Default is black.

Note: (*) – The starred options also have dedicated methods to set them. Such methods for the other options are declared obsolete.