How do I enter chemical formulae and chemical labels in ChemDraw iOS?
Chemical formulae and labels can be created and edited using the Periodic Table control. Either select the Periodic Table icon under the R-Group toolbar, or within the Atoms toolbar. Ensure that the Formula button is selected. Additional numeric buttons will then be displayed which will enable you to create chemical labels such as CF3 and formulae such as CH3CO2C2H5. Tap on an atom to apply a label or in an empty space to deposit a formula. To enter a new label or formula, press the Clear button and repeat.