Version 1.3.9 of the Mobile Molecular DataSheet (MMDS) for iOS has just come out, and it brings a nice improvement to molecule sketching: there is now an action button for converting a selected terminal group into an inline abbreviation, which is automatically set to its molecular formula:

The action subsumes the selected atoms into an inline abbreviation, so the original chemical structure is preserved. Representing formulae within a molecular structure is a very common way to condense representations of a structure, and using this method ensures that the structural nuances are not lost, i.e. the abbreviation can be restored by re-expanding it, and the overall molecular formula for the structure is still calculated correctly. Continue reading →