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A double-shafted open arrow read backwards from the product.
Also known as: Retro arrow, Disconnection arrow
A retrosynthetic arrow points from a target molecule to the simpler pieces it could be made from, so it is read against the direction of the reaction. It describes a plan rather than a process, which is why it is drawn differently from every other reaction arrow.
Points from a target molecule to precursors it could be made from, in synthetic planning.
Contexts: Laboratory
Is read in the opposite direction from a reaction arrow, describing a plan rather than a transformation, and is drawn with an open double shaft to make that unmistakable.
Contexts: Laboratory
A horizontal arrow drawn with two parallel lines as its shaft and an open unfilled head.