SMILES

Its not just an ordinary smile.

It is SMILES^TM

SMILES^TM or Simplified Molecular Input Line Entry System is a simple yet comprehensive chemical language in which molecules and reactions can be specified using ASCII characters representing atom and bond symbols. SMILES^TM contains the same information as is found in an extended connection table but with several advantages. A SMILES^TM string is human understandable, very compact, and if canonicalized represents a unique string that can be used as a universal identifier for a specific chemical structure. In addition, a chemically correct and comprehensible depiction can be made from any SMILES^TM string symbolizing either a molecule or reaction.

SMILES^TM development was initiated by David Weininger in the late 1980s using the concept of a graph with nodes as atoms and edges as bonds to represent a molecule. Parentheses are used to indicate branching points and numeric labels designate ring connection points. The basic SMILES^TM grammar also includes as well as isotopic information, configuration about double bonds, and chirality leading to what is known as isomeric SMILES^TM.

Some simple SMILES^TM examples:

Images	SMILESTM Notations
	C=CC\C=C\O
	CC(C)CC(=O)O
	CCN(CC)CC
	CCCC(C#C)C(CCC)C(C)C
	C1CCCCC1
	CC1=CC(Br)CCC1
	C1CN(CCC1)C2CCCCO2
	c1ccco1
	Oc1ccncn1
	ON1CCCCC1
	O[n+]1ccccc1
	c1ccccn1
	Oc1ccccn1
	Cn1cccc1
	C[C@H]=C\C=C\F
	c1cccn1
	C\C=C/C=C/F
	Oc1ccccn1

Here is the links that you should visit:
DAYLIGHT (Cheminformatics)
DAYLIGHT Theory : SMILES