caption: The image shows a white background with a circular diagram depicting the outer and inner parts of a molecule, with text written on it. The diagram is composed of a series of interconnected circles, each representing a different element of the molecule, such as the outer element, the inner element, and the last element. The outer element is represented by a blue circle with a white arrow pointing to the center, while the inner and outer elements are represented by green and yellow circles. The text written in the diagram is written in black font and is surrounded by a thin black border.