G-sharp minor
In Vogel's Tonnetz this chord appears to be the dual counterpiece of a major seventh chord. This interpretation is strengthened by the observation that this G-sharp minor chord with an added lower seventh (E-sharp or F is a seventh below the reference of this G-sharp minor chord, the D-sharp) resolves in an E major chord with an added upper seventh (see also the adjoining animated figure). In addition, Wagner's way to set this chord is compatible with this view, with the third (B) and the seventh (F or E-sharp) set in a low register. In Vogel's notation one would note this chord as 7Ud, as the reference note of the G-sharp minor chord is the D-sharp.