75:90:108:128 is a diminished seventh chord found on iiio7 (54) in the duodene.

Chord information
Harmonics 75:90:108:128
Subharmonics 1/(1152:960:800:675)
Intervals from root 1/16/536/25128/75
Cents from root 316¢631¢925¢
Step intervals 6/5, 6/5, 32/27
Step cents 316¢, 316¢, 294¢
Prime limit 5
Genus 3352 (675)
Intervallic odd limit 75
Otonal odd limit 75
Utonal odd limit 675
Consistent edos (d ≥ 2) 4edo**, 8edo*, 49edo*, 53edo*, …