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"Hojicha produces an aroma from pyrazine," explains Candice Ng, who works as the general manager at Stonemill Matcha in San Francisco, which sells hojicha grown in its birthplace of Kyoto, Japan.

"Pyrazine can also be found in coffee and charred items like chicken on a grill. This aroma is known to help with relaxation, the same way the smell of roasted coffee does."

Pyridine gives origin to: pyridazine or ortho-diazine, pyrimidine or meta-diazine, pyrazine or para-diazine, osotriazine, unsymmetrical triazine, symmetrical triazine, osotetrazone and tetrazine.