ISIS/Draw sketch file (SKC)
The SKC format of ISIS/Draw is imported and exported by Marvin. Most properties of atoms, bonds, groups (R-group and S-groups), query structures and reactions are supported.
Export and Import
The main features:
-     Chemical structures (atom properties, labels, bond types) 
-     Formatted text 
-     R-groups 
-     S-groups 
-     Atom and bond query properties 
-     Graphical objects (rectangle, ellipse, graphical brackets) 
-     Reactions 
Read the detailed import and export list.
Codename: skc
Extension: .skc
Note:
-     Some graphical object or objects properties are not available in Marvin (e.g. graphics arc, line style of graphical objects and underlined text). 
-     Graphical brackets are not supported by ISIS/Draw, thus all brackets are imported as S-groups.