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Alongside is a sidecar of vanilla-tonka bean maple syrup, heady with the almond-y, fresh-hay scent of coumarin — a naturally occurring chemical in the seeds of the kumaru tree.

One of the active ingredients, coumarin, can be toxic for some people's livers.

Cassia cinnamon contains up to 1% of coumarin, and the Ceylon variety contains much less, 0.004%.

Coumarin is a secondary plant compound found in various plants.

The team led by Prof. Tsogoeva at the Chair of Organic Chemistry I decided to combine artemisinin with bioactive coumarins because coumarin derivatives also possess anti-malaria properties.