2cb actually interacts the strongest with the 5-HT2B receptor, with a Ki of 13.5 nM. (see table 4)
the 5-HT2B receptor is the most "promiscuous" receptor, interacting with the most psychedelics (including 2c-e, psilocin, MDA, TMA-2, ALEPH-2, DOB...) - it's at the very top of table 5
another interesting (sidenote) from the paper: "2C-E, 2C-T-2, Aleph-2, DIPT, 5-MeO-DIPT, and DPT were provided as gifts by Alexander Shulgin."