Close parentheses, at times

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SMILES.

Last seen on: LA Times Crossword 16 May 20, Saturday

Random information on the term “SMILES”:

SMILES arbitrary target specification (SMARTS) is a language for specifying substructural patterns in molecules. The SMARTS line notation is expressive and allows extremely precise and transparent substructural specification and atom typing.

SMARTS is related to the SMILES line notation that is used to encode molecular structures and like SMILES was originally developed by David Weininger and colleagues at Daylight Chemical Information Systems. The most comprehensive descriptions of the SMARTS language can be found in Daylight’s SMARTS theory manual, tutorial and examples. OpenEye Scientific Software has developed their own version of SMARTS which differs from the original Daylight version in how the R descriptor (see cyclicity below) is defined.

Atoms can be specified by symbol or atomic number. Aliphatic carbon is matched by [C], aromatic carbon by [c] and any carbon by [#6] or [C,c]. The wild card symbols *, A and a match any atom, any aliphatic atom and any aromatic atom respectively. Implicit hydrogens are considered to be a characteristic of atoms and the SMARTS for an amino group can be written as [NH2]. Charge is specified by the descriptors + and – as exemplified by the SMARTS [nH+] (protonated aromatic nitrogen atom) and [O-]C(=O)c (deprotonated aromatic carboxylic acid).

SMILES on Wikipedia