Notes used in C♯ Dominant 7 First Inversion Chord:
E♯ + G♯ + B + C♯
Dominant 7 chords are played combining a root, major third, perfect fifth, and minor (♭) seventh notes of the root note's major scale.
Dominant 7 First Inversion Chord Formula:
3 + 5 + 7♭ + 1