NGC 6104 is a very small (48 arc-minute) Seyfert galaxy at approximately 440 million light years (Kopernik). Classification ranges from type E to SbR with ring type classifications dominating. Smirnova et. al. (2006) suggest the galaxy is in fact two galaxies in the final stage of merging with the merger fueling the AGN and that the ring structure is due to the merger tightly wrapping spiral arms as the two cores orbit each other.
Note the outflow of material from the AGN at the 11 o'clock position.