The chemical composition of "old book smell"

It starts with lignin — a compound that makes up the cell walls of plants. Turns out, it's also closely related (chemical-structure-wise) to vanillin, the stuff that makes vanilla smell so vanilla-y. Given that books are full of the broken-down cell walls of trees, a big part of what we think of as "old book smell" is actually a scent similar to vanilla.
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