This update adds molecular weight and molecular formula calculation (Menu -> Properties).  Implicit hydrogen atoms are also now displayed.  A bug which stopped searching for a name with embedded spaces has been fixed.



Here is a video of the above structure being drawn:

Quick start guide

Touch and drag anywhere  to create a single bond. Touch the end of the bond and drag to create another bond.  Touch an atom to bring up the atom dialog, then select the symbol you want.  Touch the centre of a bond to bring up the bond dialog, then select the type of bond you want. (If a wedge or hash bond is drawn the wrong way round then repeat the process  to reverse it)

To draw a bond

Touch and drag to create a single bond.  Touch and drag over an existing bond to change to a double bond, and do the same again to produce a triple bond.

To edit an atom

Tap an existing atom to bring up the atom dialog and select the atom you need.  Select + or – to increase or decrease the change on an atom.

To delete an atom

Tap an existing atom to bring up the atom dialog and select Delete.

To move an atom

Long-press on an existing atom, drag the atom to the required position and release.

To draw a ring

Long-press on an existing bond and drag to expand a ring

To draw a disconnected fragment

Long-press in empty space and select an atom to start with.  Touch-drag it to create a bond.

To undo a change

Click the Back button.

To retrieve a structure from ChemSpider

Click the Menu button and choose Search.  Type in a name (e.g. aspirin) and press OK.  The first structure found in ChemSpider will be displayed.  It can be edited if needed.

To email a structure

Click the Menu button and choose Send.  Pick a destination and the molfile will be sent.

To scroll and zoom

Touch and drag in an empty area to scroll the window.  Click the Menu button and then Zoom to bring up the zoom slider.  Move the slider to zoom in and out.