[ SMILES NOTATION ]

Simplified Molecular-Input Line-Entry System 

It is a specification in form of a line notation for describing the structure of chemical species using short ASCII strings  that can be imported by most molecule editors for conversion back into two-dimensional drawings or three-dimensional models of the molecules.

In July 2006, the IUPAC introduced the InChI as a standard for formula representation. SMILES is generally considered to have the advantage of being slightly more human-readable than InChI. It also has a wide base of software support with extensive theoretical backing.

The term SMILES refers to a line notation for encoding molecular structures and specific instances should strictly be called SMILES strings. However, the term SMILES is also commonly used to refer to both a single SMILES string and a number of SMILES strings which are the exact meaning is usually apparent from the context.

FOR EXAMPLE…

CATEGORY	DESCRIPTION
ATOMS	Atoms are represented by the standard abbreviation of the chemical elements, in square brackets, such as [Au] for gold.           An atom holding one or more electrical charges is enclosed in brackets. For hydrogen, followed by the symbol H if it is bonded to one or more atoms, followed by the number of hydrogen atoms as           Then, followed  by the sign '+' for a positive charge or by '-' for a negative charge in the same brackets.
BONDS	Bonds between aliphatic atoms are assumed to be single           Double, triple, and quadruple bonds are represented by the symbols '=', '#', and '$' respectively as illustrated by the SMILES :      O=C=O (carbon dioxide),      C#N (hydrogen cyanide)      [Ga-]$[As+] (gallium arsenide).           Ring closure labels are used to indicate connectivity between non-adjacent atoms in the SMILES string,
STEREOCHEMISTRY	Configuration around double bonds is specified using the characters "/" and "\"           For example, F/C=C/F (see depiction) is one representation of trans-difluoroethene, in which the fluorine atoms are on opposite sides of the double bond,

NOT  JUST A SIMPLE SMILE RITE...CHILL!!