Catalog › Aldehyde C-11 Undecylenic (10-Undecenal) + Coumarin
These two appear together in 2 of the accords published to the PerfuMate community. That is a record of two materials used together in real formulations, and it is only that: a record of use, not a recommendation engine. The accords are listed below so the evidence can be read.
They share no olfactive family: Aldehyde C-11 Undecylenic (10-Undecenal) is filed under Aldehydic, Floral, Aquatic and Coumarin under Sweet, Gourmand, Powdery, Herbal, Green. What joins them here is use, not classification.
Each accord is a formula published to the PerfuMate community, and these are PerfuMate's own reference accords rather than third-party work. The figures are each material's share of the concentrate in that accord.