Some dictionary common names contained "HCl" for structures without hydrochloride.

When converting CAS Registry Numbers, a more advanced detection of network proxy settings is now in place. This includes supporting the proxy auto-configuration (PAC) and the Web Proxy Autodiscovery Protocol (WPAD) protocols.

Correct systematic names are now generated for phosphorus-based groups with non-standard valence (for instance pentamethoxy-λ?-phosphane)

Some traditional names were in Chinese or Japanese instead of English.

Names were generated for some structures with query bonds.

Stereogenic axes (M/P) are now featured in generated names.

Fused names are generated in more cases, instead of the more complex bridged names.

Vowels inside brackets were sometimes not elided when required.

The term "ion" was incorrectly included in compound names.

The name generated for some chemical element was fixed.

Use the 1- locant to indicate substitution on the carbon atom of methanamine, as specified by IUPAC.

The lookup of CAS Registry Numbers was failing for some structures with stereocenters of undefined chirality.

IUPAC names are now generated for acids partially modified by halogens, for instance carbonobromidic acid.

Some groups contained an unneeded 'carbo' prefix when applied to chains, for instance propanecarboximidate instead of the correct form: propanimidate.

The names of some complex deeply substituted structures could depend on the specific input representation.

The common name of some structures with bridged cycle stereochemistry was not found.

Fused names with a long cyclic parent of length above 26 could contain invalid characters.

Names were generated for some query structures with atom lists.

Names such as "2-arylnaphthalene" are now generated for structures with simple homology groups.

Names such as "N-substituted benzamide" are now generated for structures with simple R groups.

Incorrect names were generated for some esters when the "ascii" option was used.

Some common names are now better chosen among the list of synonyms.

Traditional name generation (name:t) did not find common name for structures imported from common name when the structure contained a salt which had a dictionary name by itself.

Primed locants for skeletal replacement were not always listed in the right order.

The retained IUPAC names hydroxyl and hydroperoxyl are now generated.

Some common names were not found when generating names with the traditional ("name:t") option.

A new option, name:singleCAS#, has been introduced. While name:CAS# fetches all CAS Registry Numbers associated with the structure, singleCAS# returns the lowest one (historically assigned earlier). This option also uses a public internet webservice.

The webservice call for CAS number generation was using an HTTP redirection, resulting in slower response time.

When using the API to conver a structure to common name (format option "name:common") or to CAS registry number (format option "name:cas#"), an exception of class chemaxon.naming.s2n.NoKnownNameException is now thrown when no common name or CAS registry number is known for the structure. This is intended to make it easier for programs to distinguish those situations from failures.

Saturated rings inside fused ring systems are now correctly named based on the insaturated ring names (for instance pyrazine instead of piperazine) together with hydro prefixes.

In structures with sulfonamides (and similar groups) connected to a cyclic parent and N-substituted with some complex acyclic components, the wrong parent was selected, leading to incorrect IUPAC names.

Correct IUPAC names are now generated for simple inorganic molecules of two identical atoms such as dinitrogen and dichlorine.

IUPAC Names are now generated for ring assemblies of size 2, such as biphenyl, bifuran, bicyclohexane, ...

The group carbodithioate is now recognized.

Some multiplied substituents were missing surrounding parentheses.

The group sulfinimidoyl is now recognized.

Substituted benzyl was used in generated names, while this is not allowed by the IUPAC rules. These structures now get names based on substituted phenyl connected to a methyl parent, following the IUPAC rules.

Some ring substituents were missing locants for their own substituents.

When using the "ascii" option, non-standard valences will be indicated using "lambda..." instead of "$l^{...}" so that the name is easier to read.

Reaction molecules are now named by separating the reactents, reagents and products. For instance, molconvert name:t -s '[C].O=O>>O=C=O' returns "carbon + dioxygen ? carbon dioxide".

The "carbonylimino" group was wrongly named as "amido".

IUPAC compliant names are now generated for racemic mixtures, such as rac-(2R,3R)-3-bromobutan-2-ol.

Name generation could fail on instances of the RgMolecule class when assertion checking is enabled.

Following the new 2013 IUPAC rules, use locants N,N",N' for guanidine instead of the previously used locants 1,2,3.

Adopt the new IUPAC 2013 rules for parentheses. This leads to slightly more parentheses in some cases, where this is useful to avoid any ambiguity.

Structures with a cis/trans double bond resulting of the substitution of a parent functional group were named with an unnecessary and invalid "ene" suffix.

Structures with a radical on a chalcogen atom (O, S, ...) connect to a cyclic component were named incorrectly (ignoring the radical and substituents)

Some common names failed to be recognized depending on irrelevant factors, such as the atom order in the input structure.

Some structures with multiple identical functional groups were sometimes assigned different names depending on irrelevant factors, such as the atom order in the input structure.

IUPAC names are generated for halonium ions, such as bromanium, chloranium, ...

A novel nomenclature for enhanced stereochemistry has been introduced to name structures with multiple independent OR groups.

IUPAC names are now generated for phosphorothioic acid, phosphonothioic acid, and their derivatives, including their esters.

Significant improvements in parent selection, resulting in a stricter adherence to IUPAC rules, especially for amines and imines.

The name succinamide is now used in traditional mode.

Use unicode superscript representation for interior fusion atoms, for instance in 3a¹H-phenalene.

Wrong locants (typically N instead of N') were generated for some structures with a substituted multiplied suffix.

Name generation was failing on some structures with isotopes.

For structures with isotopes, generated names used to contain non-ASCII Unicode characters even when the ASCII option was used.

A valid but suboptimal numbering was chosen in some cases, for instance (3S,4R)-2,5-diamino-3,4-dimethylhexanedioic acid instead of (3R,4S)-2,5-diamino-3,4-dimethylhexanedioic acid.

Fixed stack overflow when generating a name in the rare case of a *-O=N-* configuration.

Structures containing an ester and a separate fragment were named as if they were a single fragment. They are now named separately using the ';' fragment name separator.