We are considering to change the type of formula used in JChem in the CD_FORMULA field and in JChem Cartridge's jc_formula function.
Any opinion is welcome about this change.
Currently, the CD_FORMULA field contains the standard formula of the record. (Non-isotopic formula, with all components merged.) A plan is to replace this with the dot-disconnected isotopic formula, as it contains more information about the compounds. Our formula search introduced in JChem 5.5 also supports all of its features. The maximum size of the CD_FORMULA and CD_SORTABLE_FORMULA fields will increase, but we do not expect large actual storage space increase from the change.
See below the description of all formula types available:
Formula: chemical formula of the molecule according to the Hill system 3:
the number of carbon atoms is indicated first, the number of hydrogen
atoms next (including deuterium and tritium when using D and T symbols),
and then the number of all other chemical elements subsequently, in
alphabetical order. When the formula contains no carbon, all the
elements, including hydrogen, are listed alphabetically.Isotope formula: chemical formula of the molecule listing isotopes separately according to the Hill system.Dot-disconnected formula:
chemical formula of the molecule(s) separating fragment formulas by
dots (e.g. salts, counterions, solvent molecules etc. are present).Dot-disconnected isotope formula: chemical formula of the molecule separating fragment formulas by dots and listing isotopes separately.
The attached image below shows an example.