IPTABLES: list all chain names

Hi,

I need to get a list of all (user-defined) chains in the table "filter".
Till now I was doing this:

iptables -L -n|grep references|cut -d" " -f2

This is far to slow on big configurations. To get to the 2nd segment of
the pipe expression all rules have to given out before. Is there an
easier way to get on the names of all user defined chains?

Thanks in advanced

Thomas