It hits my ear as an implied first inversion of a B7 chord, with the tension 9 replacing the B (they're often substituted for the root). But it's hard to type out on here with no superscript numerals, and inversions get written in different ways depending on the idiom anyway (figured bass really doesn't help in this case, just turns everything into alphabet soup - they didn't really go in for jazz harmonies).

As has been mentioned, it's also a minor seven flat five, but the dominant-seventh inversion is the thing I naturally hear.