Composer and theosophist Alexander Scriabin's so called mystic chord, actually called the synthetic chord by Scriabin, consists of the pitch classes: C, F#, Bb, E, A, D. An augmented fourth, diminished fourth, augmented fourth, and two perfect fourths. It is a quartal hexachord.
Scriabin used this chord in what George Perle calls a pre-serial manner, producing harmonys, chordss, and melodies. However, unlike the twelve tone technique to which Perle refers, Scriabin did not use his synthetic chord as an ordered set.