BondLabels

is an option for MoleculePlot and MoleculePlot3D that specifies what labels and label positions should be used for bonds.

Details

	None	use no edge labels
	"BondIndex"	use the bond index as a label
	"BondStereo"	use the stereo for double bonds as a label
	{Bond[{a_i,a_j}]->lbl_ij,…}	label specific bonds
	{patt_ilbl_i,…}	use lbl_i for bonds matching the pattern patt_i

Placed[lbl,pos] can be used to place labels along a bond.
The following positions pos can be used for Labeled and Placed in positioning edge labels:

	Tooltip,StatusArea	show as tooltip or in status area on mouseover
	"Start","Middle","End"	place label at start, middle or end
	{Left,pos},{Right,pos}	place label left or right of the bond at symbolic position
	{s,{l_x,l_y}}	scaled position {l_x,l_y} in the label at scaled position s along the bond

open allclose all

Label a specific bond:

Label only bonds matching a pattern:

Plot the molecule with labels in 3D:

Place a label along a bond:

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