Smell Of Rain ?

Geosmin is an organic compound with a distinct earthy flavor and aroma produced by a type of Actinobacteria, and is responsible for the earthy taste of beets and a contributor to the strong scent (petrichor) that occurs in the air when rain falls after a dry spell of weather or when soil is disturbed.
In chemical terms, it is a bicyclic alcohol with formulaC₁₂H₂₂O, a derivative of decalin.