I have a production database with oracle 7.2 on Unix

I added one datafile and by mistake it got added to worng tablespace and there is no option to drop a datafile

One thing is that its completely empty now how do i go about removing it itried an it went in recover stage means

V$datafile shows recover as a status for this datafile

I dont need this datafile at all

How do i go about it

Regards
Irfan Khan