I've been incorporating some new chest exercises in my workout routine lately and this one has been treating me the very best. I don't know what you would call it, but it feels as if you're doing a chest press and a dumbell fly at the same time. It really taxes the inside middle of the chest since you're having to focus on keeping the dumbells inline together. One thing that I have found is that it's fairly demanding on the tricep muscles, so I would incorporate this movement into your chest exercise at the very end of your workout. Especially if you follow up your chest day with dips and/or isolated triceps exercises.
Grace and peace,
Mavsluva