http://www.tictac.org.uk/
Someone i know has access to the tictac visual drugs identification database and there were some mitzis on there which were tested to be 2CB! Possibly this could have been what you had? The duration sounds a bit short but after 2-3 hours, you'd be well on your way down from 2c-b.
I'm going to have to try and get a look at this database as the person who has access to it says there are some tests of pills like the rolexes that were going around (and subsequent duds), some were MDMA and amphetamine, which surprised me as they were pretty trippy, although that could have been a different batch.