Represent and store extended tetrahedral stereochemistry.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
Conversion of extended tetrahedral stereochemistry to/from InChI.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
Extended tetrahedral depiction.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
Extended tetrahedral support in SMILES.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
Latest version of Beam with support for parsing and encoding extended tetrahedral stereochemistry.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>