Try going into Chord Builder. That will show all chords by name and by manipulating the choices you can hear each one.
I had similar problem to you recently and used chord builder to work it out - turned out to be B5b.
There is a recent post, started by me, when I got stuck using it. Scroll down a few days and you should see it.
HTH
Ian

Old Guys Rule.The older I get,the better I was!
BB2023 ULTRA, 1013, Win 7 and 10

ALL TRACKS - https://app.box.com/s/501rnzrbadng1elvi45hbf7y08kl5oxp
SOUNDCLOUD-tracks using BB-
http://soundcloud.com/sixchannel
Videos-
https://youtube.com/user/Sixchannel1