Electron flow double arrow
Default electron flow arrow setting. It is also a combo button: the other types of arrows can be selected after clicking on the black triangle 
in the lower-right corner of the button.
What kind of electron flow arrows (curved arrows) are available in Marvin JS?
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Electron flow arrow symbol |
Electron flow arrow type |
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Electron flow single arrow |
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Electron flow double arrow |
How to draw an electron flow arrow from an atom to an atom
Select the preferred type of electron flow arrow button.
Drag the electron flow arrow from the electron(s) to the target atom or bond. A grey feedback of the arrow appears.
Please, note that drawing electron flow arrows starting from lone pairs is only possible when lone pair visibility is turned on in View settings.