| − | SMILES has highly specific rules for specifying tetrahedral, allene-like, square-planar, trigonal-bipyramidal, octahedral, and other orientations.<ref>[http://www.daylight.com/dayhtml/doc/theory/theory.smiles.html SMILES = A Simplified Chemical Language] from Daylight Chemical Information Systems, Inc.</ref> | + | SMILES has highly specific rules for specifying tetrahedral, allene-like, square-planar, trigonal-bipyramidal, octahedral, and other orientations.<ref>[http://www.daylight.com/dayhtml/doc/theory/theory.smiles.html SMILES: A Simplified Chemical Language] from Daylight Chemical Information Systems, Inc.</ref> |