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Geosmin is a bicyclic alcohol produced by various bacteria noted for its distinct "earthy" scent. It is a component of Petrichor, the famous smell experienced just after some rain. I've had first hand experience of it when culturing 𝘚𝘵𝘳𝘦𝘱𝘵𝘰𝘮𝘺𝘤𝘦𝘴 from soil samples!