A miscellaneous interest annotation is indicated by a two-character miscellaneous interest annotation marker (MIAM). MIAM annotations can be used to enhance molecule and material encodings by various details. MIAMS and their purpose are given in the following table.

MIAM Meaning and usage
__ blank marker (“double underscore”), used to indicate that any additional information is directly given in the annotation dictionary (for example, see notation enhancement by name, acronym and code)
AD adsorption or adlayer: description of the adsorption of a molecule to a surface; note that covalent bonding (grafting) to as well as atom-specific interaction with a material surface is encoded with an annotation marked by -| or ~|, respectively
AN anchoring or grafting: description of attachment to a solid material
CH charge information applying to the overall structure
CT coating information applying to solid materials
EX extracted applying to a chemical species extracted from a material by an extracting agent
IM impurity, dopant or embedded substance contained in annotated structure
MO modification applying to annotated material
SD stereodescription: stereochemical details other than those provided with the stereodescriptive annotations D, E, L, R, S, and Z, for example, distinction between helical enantiomers
SP spin-of-proton description, typically used in combination with a isp dictionary entry
VA vacancy, vacant lattice site in crystal (see CurlySMILES encoding of vacant lattice sites)
@* enclosure by a bulk material or matrix (inverse of IM, switching focus from the bulk to the impurity or dopant)
@= intercalated in a host matrix or between (supra-)molecules
@: enclosure by a polyhedral molecule (cage molecule) as, for example, one or more atoms in a fullerene (endohedral fullerenes)
|| solid-solid interface or contact
:: fluid-fluid interface or contact
|: solid-fluid interface or contact
:| fluid-solid interface or contact

Reference

A. Drefahl: CurlySMILES: a chemical language to customize and annotate encodings of molecular and nanodevice structures . J. Cheminf. 2011, 3:1; doi: 10.1186/1758-2946-3-1 .
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