Abell 2666 is located about 340 million light years away in Pegasus. Its largest member is the huge cD elliptical NGC 7768. The distance would seem to place this within the Perseus-Pisces supercluster, but Atlas of the Universe suggests that the galaxy groups in Pegasus form an independent small supercluster. I haven't seen any discussion about this elsewhere one way or the other.
My favorite galaxy in this group is the heavily distorted barred spiral PGC72600 in upper left, which is almost a ring galaxy, with a "fan" of stars spreading to its upper right.
Full details of capture and processing are below the image.