Compare Databases Between 2 SQL Servers

Hello,
I wish to see if the tables from database A server A1 exist in database
A on server B1.
I setup a linked server from my first server (robertcamarda) to a
target (cognos-dev)
This works from robertcamarda:
select count(*) from [cognos-dev].ds_v6_source.dbo.stdmas

and this works:
select * from ds_v6_source.information_schema.tables order by
table_name

but this wont work:
select * from [cognos-dev].ds_v6_source.information_schema.tables order
by table_name

Error:
Msg 117, Level 15, State 1, Line 1
The object name 'cognos-dev.ds_v6_source.dbo.information_schema.tables'
contains more than the maximum number of prefixes. The maximum is 3.

I want to do something like:
select * from ds_v6_source.information_schema.tables
where table_name not in (select table_name from
[cognos-dev].ds_v6_source.information_schema.tables order by
table_name)

so I can see of the sql server (robertcamarda) has any missing tables
that exist on the server (cognos-dev)
TIA
Rob
SQL Server 2005 Enterprise