Getting ORA-00933: SQL command not properly ended, when running the following query?

[jsmith01]

SELECT filtered.geom FROM (
select * from buildings b
where sdo_FILTER(b.geom,
sdo_geometry( 2003, null, null, sdo_elem_info_array(1,1003,3), sdo_ordinate_array( 50,50, 400, 400) ) ) = 'TRUE'
) as filtered
WHERE sdo_NN( filtered, sdo_geometry(2001, null, sdo_point_type(200,200,null),null,null), 'sdo_num_res=1') = 'TRUE';

Any idea what is wrong? I checked many times, all bracers are matched, as you can see

 

[LKBrwnDBA]

Remove the 'AS' from "AS filtered"


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