|CDX Constant Name:||kCDXProp_Atom_RestrictFreeSites|
|CDX Constant Value:||0x0423|
|Property of objects:||kCDXObj_Node|
|First written/read in:||ChemDraw 4.0|
Indicates that up to the specified number of additional substituents are permitted on this atom.
A substituent is defined as some other node bonded to this one. It is strictly a count of attached bonds, and not a count of bond orders.
A value of zero indicates that the atom must be matched as drawn.
If this property is absent:
The node is treated as unrestricted in terms of free sites.