Root : D
Minor 3rd : F
5th : A
Dominant 7th : C
9th : E
Dm9/C
Dm9
Dm9/E
Dm9/F
The minor ninth chord consist of a minor seventh chord and a major ninth. The formula is 1, ♭3, 5, ♭7, 9. This chord has a more "bluesy" sound and fits very well with the dominant ninth.