Syringaldehyde

Description and usage notes:

Another neglected perfumery material that deserves to be better known, this comes as white crystals that dissolve readily in ethanol, it has fixative properties and is a useful modifier for many fragrance types particularly with floral and chocolate or incense notes.

Here’s Arctander talking about its scent: “Sweet, balsamic-floral odor of considerable tenacity. lt has notes in common with Vanillin but is not as sweet and not as Vanilla-like, more floral and slightly greener.”

The material would probably see much wider use but for its relatively high price