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According to OPSIN 0.5.0 Change log :
Supported nomenclature includes:
alkanes/alkenes/alkynes/heteroatom chains e.g. hexane, hex-1-ene, tetrasiloxane and their cyclic analogues e.g. cyclopropane
All IUPAC 1993 recommended rings
Trivial acids
Hantzsch-Widman e.g. 1,3-oxazole
Mono spiro systems
All von Baeyer rings e.g. bicyclo[2.2.2]octane
Hydro e.g. 2,3-dihydropyridine
Indicated hydrogen e.g. 1H-benzoimidazole
Heteroatom replacement
Specification of charge e.g. ium/ide
Multiplicative nomenclature e.g. ethylenediaminetetraacetic acid
Fused ring systems with only two rings e.g. imidazo[4,5-d]pyridine
Ring assemblies e.g. biphenyl
The following functional classes: esters, diesters, glycols, acids, azides, bromides, chlorides, cyanates, cyanides, fluorides, fulminates, hydroperoxides, iodides, isocyanates, isocyanides, isoselenocyanates, isothiocyanates, selenocyanates, thiocyanates, alcohols, selenols, thiols, ethers, ketones, peroxides, selenides, selenones, selenoxides, selones, selenoketones, sulfides, sulfones, sulfoxides, tellurides, telluroketones, tellurones, telluroxides and thioketones
Currently UNsupported nomenclature includes:
Stereochemistry (terms are identified and ignored)
Greek letters
Lambda convention
Amino Acids (simple subsitutitive operations are allowed)
Carbohydrates
Steroids
Nucleic acids
Bridged rings
Fused ring systems with more than two rings
Some conjuctive operations e.g. cyclohexaneethanol
Functional replacement nomenclature e.g. ethanthioic acid
The following functional classes: Hydrazides, lactones, lactams, acetals, hemiacetals, oxime, oxides, ketals, hydrazones, anhydrides and semicarbazones