To convert simple Excel images, which are converted from structures, follow the below steps.
Excel images inserted to the worksheet by other means cannot be converted to structures. This functionality is simply the reverse of Convert Structures to Images.
Select a whole column or a whole row. It is also possible to convert single images to structures. In this case, select the cell behind the image. (The conversion cannot be done if only the image is selected without the cell behind because the image itself is only a floating object and the structure cannot be localized to a specific cell.)
Click the From Image button, which is available on the advanced JChem ribbon under the Data conversion group or through the context menu ( Convert > From Image) .
The Excel images are converted to structures.